# UC flashcards ## Transaction A request and its matching responses. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 Room or sheet file: ../rooms/sources/sip-transactions/sources.json ## Dialog A peer relationship identified by Call-ID and tags. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 Room or sheet file: ../rooms/sources/sip-transactions/sources.json ## SIP transactions and dialogs A transaction pairs a request with its responses. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 Room or sheet file: ../rooms/sources/sip-transactions/sources.json ## A 180 Ringing means the call was answered. False. False. It means alerting. The 200 accepts the session. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 Room or sheet file: ../rooms/sources/sip-transactions/sources.json ## ACK for a 2xx is optional. False. False. Without ACK the far end retransmits the 200 and can drop the call. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 Room or sheet file: ../rooms/sources/sip-transactions/sources.json ## Early offer SDP in the INVITE. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/offer-answer/sources.json ## Delayed offer SDP offered in the reliable response or the 200. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/offer-answer/sources.json ## Offer and answer SDP is the offer or the answer, not a second signaling protocol you ignore. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/offer-answer/sources.json ## The answer may add a codec the offer did not list. False. False. The answer narrows the offer. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/offer-answer/sources.json ## AOR The address-of-record being registered. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Skinny Client Control Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Skinny_Call_Control_Protocol). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/sip-registration/sources.json ## Contact The device URI to try later. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Skinny Client Control Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Skinny_Call_Control_Protocol). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/sip-registration/sources.json ## Registration REGISTER publishes a Contact. It does not place a call. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Skinny Client Control Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Skinny_Call_Control_Protocol). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/sip-registration/sources.json ## REGISTER creates a voice session. False. False. It stores a Contact binding. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Skinny Client Control Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Skinny_Call_Control_Protocol). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/sip-registration/sources.json ## PRACK Acknowledgement of a reliable provisional response. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3262, reliable provisional responses (PRACK)](https://www.rfc-editor.org/rfc/rfc3262). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/prack-early-media/sources.json ## 100rel The extension that makes selected 1xx responses reliable. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3262, reliable provisional responses (PRACK)](https://www.rfc-editor.org/rfc/rfc3262). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/prack-early-media/sources.json ## Early media and PRACK 183 Session Progress can carry SDP before answer. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3262, reliable provisional responses (PRACK)](https://www.rfc-editor.org/rfc/rfc3262). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/prack-early-media/sources.json ## Hearing ringback proves the called party answered. False. False. Ringback can be early media. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3262, reliable provisional responses (PRACK)](https://www.rfc-editor.org/rfc/rfc3262). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/prack-early-media/sources.json ## Partition A group of patterns with the same reachability. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/partitions-css/sources.json ## CSS An ordered list of partitions. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/partitions-css/sources.json ## Partitions and calling search spaces A partition is a bucket of patterns. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/partitions-css/sources.json ## CUCM searches every partition and picks the longest match across all of them. False. False. It walks the CSS in order. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/partitions-css/sources.json ## Route pattern Digits in a partition that point at a gateway or route list. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/route-patterns/sources.json ## Route list An ordered set of route groups. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/route-patterns/sources.json ## Route patterns, lists, and groups A route pattern matches digits. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/route-patterns/sources.json ## A route group is a list of partitions. False. False. It is a list of gateways or trunks. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/route-patterns/sources.json ## Translation pattern A pattern that transforms digits and can continue routing. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/transformations/sources.json ## Mask A digit rewrite applied to a number field. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/transformations/sources.json ## Transformations Called, calling, and redirecting numbers are different fields. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/transformations/sources.json ## The calling number and the called number are the same field. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. [CUCM (Wikipedia disambiguation)](https://en.wikipedia.org/wiki/CUCM). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: ../rooms/sources/transformations/sources.json ## SIP trunk CUCM's signaling peer toward a gateway or another call agent. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4028, SIP session timers](https://www.rfc-editor.org/rfc/rfc4028). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/sip-trunks/sources.json ## SIP profile Timers, OPTIONS, and offer behavior for that trunk. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4028, SIP session timers](https://www.rfc-editor.org/rfc/rfc4028). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/sip-trunks/sources.json ## SIP trunks on CUCM The trunk, the SIP profile, and the security profile are three objects. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4028, SIP session timers](https://www.rfc-editor.org/rfc/rfc4028). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/sip-trunks/sources.json ## A SIP trunk in service proves the route pattern points at it. False. False. Routing and status are separate. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 4028, SIP session timers](https://www.rfc-editor.org/rfc/rfc4028). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/sip-trunks/sources.json ## Dial peer An IOS rule that matches a call and names a target. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Cisco. [CUBE configuration guide, dial peers (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_cube-dp.html). last checked 2026-10 - RFC. [RFC 4733, RTP telephony events](https://www.rfc-editor.org/rfc/rfc4733). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Border Element. confirm. That title returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/dial-peers/sources.json ## Preference A tie-break after match length. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Cisco. [CUBE configuration guide, dial peers (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_cube-dp.html). last checked 2026-10 - RFC. [RFC 4733, RTP telephony events](https://www.rfc-editor.org/rfc/rfc4733). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Border Element. confirm. That title returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/dial-peers/sources.json ## Dial peers A dial peer matches an incoming or outgoing call. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Cisco. [CUBE configuration guide, dial peers (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_cube-dp.html). last checked 2026-10 - RFC. [RFC 4733, RTP telephony events](https://www.rfc-editor.org/rfc/rfc4733). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Border Element. confirm. That title returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/dial-peers/sources.json ## Outbound dial-peer preference is consulted before match length. False. False. Longest match comes first when hunt is the default. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Cisco. [CUBE configuration guide, dial peers (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_cube-dp.html). last checked 2026-10 - RFC. [RFC 4733, RTP telephony events](https://www.rfc-editor.org/rfc/rfc4733). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Border Element. confirm. That title returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/dial-peers/sources.json ## B2BUA A user agent that sits between two dialogs. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Cisco. [CUBE configuration guide, dial peers (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_cube-dp.html). last checked 2026-10 - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Border Element. confirm. That title returned HTTP 404. last checked 2026-10 - RFC. [RFC 4733, RTP telephony events](https://www.rfc-editor.org/rfc/rfc4733). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 Room or sheet file: ../rooms/sources/cube-b2bua/sources.json ## Media anchor RTP terminates on the SBC. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Cisco. [CUBE configuration guide, dial peers (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_cube-dp.html). last checked 2026-10 - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Border Element. confirm. That title returned HTTP 404. last checked 2026-10 - RFC. [RFC 4733, RTP telephony events](https://www.rfc-editor.org/rfc/rfc4733). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 Room or sheet file: ../rooms/sources/cube-b2bua/sources.json ## CUBE as a B2BUA CUBE terminates one dialog and starts another. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Cisco. [CUBE configuration guide, dial peers (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_cube-dp.html). last checked 2026-10 - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Border Element. confirm. That title returned HTTP 404. last checked 2026-10 - RFC. [RFC 4733, RTP telephony events](https://www.rfc-editor.org/rfc/rfc4733). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 Room or sheet file: ../rooms/sources/cube-b2bua/sources.json ## CUBE forwards one SIP dialog unchanged, like a proxy. False. False. It is a B2BUA. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Cisco. [CUBE configuration guide, dial peers (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_cube-dp.html). last checked 2026-10 - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Border Element. confirm. That title returned HTTP 404. last checked 2026-10 - RFC. [RFC 4733, RTP telephony events](https://www.rfc-editor.org/rfc/rfc4733). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 Room or sheet file: ../rooms/sources/cube-b2bua/sources.json ## SRST Fallback call processing on the branch router. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified SRST product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-survivable-remote-site-telephony/series.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. English Wikipedia article for Survivable Remote Site Telephony. confirm. That title returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/srst/sources.json ## Re-home Phones returning to CUCM after the WAN recovers. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified SRST product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-survivable-remote-site-telephony/series.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. English Wikipedia article for Survivable Remote Site Telephony. confirm. That title returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/srst/sources.json ## SRST SRST is the fallback when phones cannot reach CUCM. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified SRST product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-survivable-remote-site-telephony/series.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. English Wikipedia article for Survivable Remote Site Telephony. confirm. That title returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/srst/sources.json ## SRST automatically clones every CUCM hunt pilot. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified SRST product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-survivable-remote-site-telephony/series.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Wikipedia. English Wikipedia article for Survivable Remote Site Telephony. confirm. That title returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/srst/sources.json ## Local gateway The premises SBC that connects Webex Calling to PSTN or a PBX. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Webex. [Configure Local Gateway on Cisco IOS XE for Webex Calling](https://help.webex.com/en-us/article/jr1i3r/Configure-local-gateway-on-IOS-XE-for-Webex-Calling). last checked 2026-10 - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/local-gateway/sources.json ## Certificate trunk A trunk that authenticates with a certificate instead of a registration. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Webex. [Configure Local Gateway on Cisco IOS XE for Webex Calling](https://help.webex.com/en-us/article/jr1i3r/Configure-local-gateway-on-IOS-XE-for-Webex-Calling). last checked 2026-10 - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/local-gateway/sources.json ## Local gateway toward Webex Calling The local gateway is how premises PSTN or a PBX meets Webex Calling. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Webex. [Configure Local Gateway on Cisco IOS XE for Webex Calling](https://help.webex.com/en-us/article/jr1i3r/Configure-local-gateway-on-IOS-XE-for-Webex-Calling). last checked 2026-10 - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/local-gateway/sources.json ## A local gateway registration is the same object as a CUCM phone registration. False. False. It is the trunk from CUBE toward Calling. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Webex. [Configure Local Gateway on Cisco IOS XE for Webex Calling](https://help.webex.com/en-us/article/jr1i3r/Configure-local-gateway-on-IOS-XE-for-Webex-Calling). last checked 2026-10 - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/local-gateway/sources.json ## Traversal zone The zone that joins Expressway-C and Expressway-E. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Cisco. [Mobile and Remote Access through Cisco Expressway, X15.2](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-2/mra/exwy_b_mra-deployment-guide-x152.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/expressway-pair/sources.json ## Expressway-E The edge server. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Cisco. [Mobile and Remote Access through Cisco Expressway, X15.2](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-2/mra/exwy_b_mra-deployment-guide-x152.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/expressway-pair/sources.json ## Expressway-C and Expressway-E Expressway-C lives on the inside, next to CUCM. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Cisco. [Mobile and Remote Access through Cisco Expressway, X15.2](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-2/mra/exwy_b_mra-deployment-guide-x152.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/expressway-pair/sources.json ## Every CUCM call must pass through Expressway. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Cisco. [Mobile and Remote Access through Cisco Expressway, X15.2](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-2/mra/exwy_b_mra-deployment-guide-x152.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/expressway-pair/sources.json ## MRA Mobile and Remote Access through Expressway. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Mobile and Remote Access through Cisco Expressway, X15.2](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-2/mra/exwy_b_mra-deployment-guide-x152.html). last checked 2026-10 - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/mra/sources.json ## SRV A DNS record the client uses to find the edge. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Mobile and Remote Access through Cisco Expressway, X15.2](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-2/mra/exwy_b_mra-deployment-guide-x152.html). last checked 2026-10 - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/mra/sources.json ## Mobile and Remote Access MRA lets a remote Cisco phone or Jabber register to CUCM through the Expressway pair. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Mobile and Remote Access through Cisco Expressway, X15.2](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-2/mra/exwy_b_mra-deployment-guide-x152.html). last checked 2026-10 - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/mra/sources.json ## MRA replaces CUCM as the registrar. False. False. CUCM remains the registrar. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Mobile and Remote Access through Cisco Expressway, X15.2](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-2/mra/exwy_b_mra-deployment-guide-x152.html). last checked 2026-10 - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/mra/sources.json ## Traversal media The UDP range Expressway uses for remote media. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 8445, ICE](https://www.rfc-editor.org/rfc/rfc8445). last checked 2026-10 - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/firewall-traversal/sources.json ## Signaling SIP or the HTTPS path used to register. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 8445, ICE](https://www.rfc-editor.org/rfc/rfc8445). last checked 2026-10 - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/firewall-traversal/sources.json ## Firewall and traversal Open the ports your version's guide lists. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 8445, ICE](https://www.rfc-editor.org/rfc/rfc8445). last checked 2026-10 - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/firewall-traversal/sources.json ## A completed INVITE proves the firewall allows RTP. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 8445, ICE](https://www.rfc-editor.org/rfc/rfc8445). last checked 2026-10 - Cisco. [Cisco Expressway Series product support](https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/series.html). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/firewall-traversal/sources.json ## EF Expedited Forwarding, DSCP 46. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3246, Expedited Forwarding](https://www.rfc-editor.org/rfc/rfc3246). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - ITU. [ITU-T G.114, one-way transmission time](https://www.itu.int/rec/T-REC-G.114). last checked 2026-10 - ITU. [ITU-T G.711, pulse code modulation of voice](https://www.itu.int/rec/T-REC-G.711). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Differentiated services (Wikipedia)](https://en.wikipedia.org/wiki/Differentiated_services). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/dscp-trust/sources.json ## Trust boundary The place you decide to keep or rewrite a mark. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3246, Expedited Forwarding](https://www.rfc-editor.org/rfc/rfc3246). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - ITU. [ITU-T G.114, one-way transmission time](https://www.itu.int/rec/T-REC-G.114). last checked 2026-10 - ITU. [ITU-T G.711, pulse code modulation of voice](https://www.itu.int/rec/T-REC-G.711). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Differentiated services (Wikipedia)](https://en.wikipedia.org/wiki/Differentiated_services). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/dscp-trust/sources.json ## DSCP and the trust boundary Voice RTP is commonly marked EF, DSCP 46. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3246, Expedited Forwarding](https://www.rfc-editor.org/rfc/rfc3246). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - ITU. [ITU-T G.114, one-way transmission time](https://www.itu.int/rec/T-REC-G.114). last checked 2026-10 - ITU. [ITU-T G.711, pulse code modulation of voice](https://www.itu.int/rec/T-REC-G.711). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Differentiated services (Wikipedia)](https://en.wikipedia.org/wiki/Differentiated_services). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/dscp-trust/sources.json ## EF and CS3 are the same mark. False. False. EF is DSCP 46. CS3 is a different codepoint. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3246, Expedited Forwarding](https://www.rfc-editor.org/rfc/rfc3246). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - ITU. [ITU-T G.114, one-way transmission time](https://www.itu.int/rec/T-REC-G.114). last checked 2026-10 - ITU. [ITU-T G.711, pulse code modulation of voice](https://www.itu.int/rec/T-REC-G.711). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Differentiated services (Wikipedia)](https://en.wikipedia.org/wiki/Differentiated_services). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/dscp-trust/sources.json ## LLQ A queue that serves a priority class up to a configured rate. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3246, Expedited Forwarding](https://www.rfc-editor.org/rfc/rfc3246). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - ITU. [ITU-T G.114, one-way transmission time](https://www.itu.int/rec/T-REC-G.114). last checked 2026-10 - ITU. [ITU-T G.711, pulse code modulation of voice](https://www.itu.int/rec/T-REC-G.711). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Differentiated services (Wikipedia)](https://en.wikipedia.org/wiki/Differentiated_services). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/llq-delay/sources.json ## Packetization The time to fill one RTP payload. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3246, Expedited Forwarding](https://www.rfc-editor.org/rfc/rfc3246). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - ITU. [ITU-T G.114, one-way transmission time](https://www.itu.int/rec/T-REC-G.114). last checked 2026-10 - ITU. [ITU-T G.711, pulse code modulation of voice](https://www.itu.int/rec/T-REC-G.711). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Differentiated services (Wikipedia)](https://en.wikipedia.org/wiki/Differentiated_services). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/llq-delay/sources.json ## LLQ and the delay budget Priority queue bandwidth is a limiter for the EF class. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3246, Expedited Forwarding](https://www.rfc-editor.org/rfc/rfc3246). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - ITU. [ITU-T G.114, one-way transmission time](https://www.itu.int/rec/T-REC-G.114). last checked 2026-10 - ITU. [ITU-T G.711, pulse code modulation of voice](https://www.itu.int/rec/T-REC-G.711). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Differentiated services (Wikipedia)](https://en.wikipedia.org/wiki/Differentiated_services). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/llq-delay/sources.json ## LLQ adds bandwidth to a circuit. False. False. It schedules the bandwidth you already have. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3246, Expedited Forwarding](https://www.rfc-editor.org/rfc/rfc3246). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - ITU. [ITU-T G.114, one-way transmission time](https://www.itu.int/rec/T-REC-G.114). last checked 2026-10 - ITU. [ITU-T G.711, pulse code modulation of voice](https://www.itu.int/rec/T-REC-G.711). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Differentiated services (Wikipedia)](https://en.wikipedia.org/wiki/Differentiated_services). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/llq-delay/sources.json ## Location A CUCM bandwidth domain for admission control. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/locations-cac/sources.json ## CAC Call admission control, the decision to allow a call. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/locations-cac/sources.json ## Locations and call admission control A CUCM location names a bandwidth budget between sites. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/locations-cac/sources.json ## CUCM locations mark RTP as EF. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - RFC. [RFC 4594, DiffServ service classes](https://www.rfc-editor.org/rfc/rfc4594). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Quality of service (Wikipedia)](https://en.wikipedia.org/wiki/Quality_of_service). last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 Room or sheet file: ../rooms/sources/locations-cac/sources.json ## CVP Customer Voice Portal, the voice browser and call-control front in many designs. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/ucce-path/sources.json ## ICM The routing brain in UCCE. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/ucce-path/sources.json ## UCCE from carrier to agent Ingress, routing, queue treatment, and the agent are different stages. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/ucce-path/sources.json ## Queue music means an agent phone is ringing. False. False. Treatment happens before delivery. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 Room or sheet file: ../rooms/sources/ucce-path/sources.json ## Label The destination the script returns. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/cucm-ucce-bridge/sources.json ## Peripheral gateway The process that represents CUCM devices to ICM. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/cucm-ucce-bridge/sources.json ## The CUCM bridge into UCCE Agents are CUCM endpoints. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/cucm-ucce-bridge/sources.json ## A successful ICM script guarantees CUCM can ring the phone. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/cucm-ucce-bridge/sources.json ## Flow The routing document in Webex Contact Center. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/wxcc-and-ucce/sources.json ## Script The routing document in ICM. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/wxcc-and-ucce/sources.json ## Webex Contact Center beside UCCE Webex Contact Center and UCCE are different products. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/wxcc-and-ucce/sources.json ## An ICM script runs unchanged inside Webex Contact Center. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Unified Contact Center Enterprise product support](https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-enterprise/series.html). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/wxcc-and-ucce/sources.json ## Dedicated Instance A hosted CUCM offer inside the Webex cloud contract. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/calling-versus-di/sources.json ## Control Hub The admin place for Webex Calling locations and numbers. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/calling-versus-di/sources.json ## Webex Calling and Dedicated Instance Multi-tenant Webex Calling and Dedicated Instance are different offers. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/calling-versus-di/sources.json ## Dedicated Instance uses the same dial-plan objects as multi-tenant Calling. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/calling-versus-di/sources.json ## Dual-run Old and new paths both available for a number during a test. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/dual-run/sources.json ## Rollback Returning the number to the path you saved. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/dual-run/sources.json ## Dual-run and rollback Move one number you can give back. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/dual-run/sources.json ## A carrier port can always be undone in five minutes. False. False. Confirm the porting rules. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 Room or sheet file: ../rooms/sources/dual-run/sources.json ## Survivability gateway A local gateway mode that keeps selected Calling users up during a cloud outage. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Webex. [Configure Local Gateway on Cisco IOS XE for Webex Calling](https://help.webex.com/en-us/article/jr1i3r/Configure-local-gateway-on-IOS-XE-for-Webex-Calling). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Webex. Webex Calling survivability gateway guide. confirm. A survivability-gateway article was not opened, so this row has no link. The local-gateway guide that did open is listed above. last checked 2026-10 - Cisco. [Cisco Unified SRST product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-survivable-remote-site-telephony/series.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cutover-survivability/sources.json ## Fallback test A planned failure of the primary path. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Webex. [Configure Local Gateway on Cisco IOS XE for Webex Calling](https://help.webex.com/en-us/article/jr1i3r/Configure-local-gateway-on-IOS-XE-for-Webex-Calling). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Webex. Webex Calling survivability gateway guide. confirm. A survivability-gateway article was not opened, so this row has no link. The local-gateway guide that did open is listed above. last checked 2026-10 - Cisco. [Cisco Unified SRST product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-survivable-remote-site-telephony/series.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cutover-survivability/sources.json ## Survivability during cutover Cloud calling needs a plan for when the cloud path is down. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Webex. [Configure Local Gateway on Cisco IOS XE for Webex Calling](https://help.webex.com/en-us/article/jr1i3r/Configure-local-gateway-on-IOS-XE-for-Webex-Calling). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Webex. Webex Calling survivability gateway guide. confirm. A survivability-gateway article was not opened, so this row has no link. The local-gateway guide that did open is listed above. last checked 2026-10 - Cisco. [Cisco Unified SRST product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-survivable-remote-site-telephony/series.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cutover-survivability/sources.json ## SRST protects Webex Calling apps with no extra design. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Webex. [Get started with Webex Calling](https://help.webex.com/en-us/article/8jda92/Webex-Calling). last checked 2026-10 - Webex. [Webex Help Center](https://help.webex.com/). last checked 2026-10 - Webex. [Get started with Local Gateway](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway). last checked 2026-10 - Webex. [Configure Local Gateway on Cisco IOS XE for Webex Calling](https://help.webex.com/en-us/article/jr1i3r/Configure-local-gateway-on-IOS-XE-for-Webex-Calling). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Webex. Webex Calling survivability gateway guide. confirm. A survivability-gateway article was not opened, so this row has no link. The local-gateway guide that did open is listed above. last checked 2026-10 - Cisco. [Cisco Unified SRST product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-survivable-remote-site-telephony/series.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cutover-survivability/sources.json ## Hypothesis The single fault you are testing. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 Room or sheet file: ../rooms/sources/one-change/sources.json ## Evidence pack The traces and notes that show the test. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 Room or sheet file: ../rooms/sources/one-change/sources.json ## One hypothesis, one change Say what you think is broken, in one sentence. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 Room or sheet file: ../rooms/sources/one-change/sources.json ## Changing the CSS, the codec, and the gateway in one window is a clean test. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 Room or sheet file: ../rooms/sources/one-change/sources.json ## Ladder A drawing of messages between named boxes. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3515, SIP REFER](https://www.rfc-editor.org/rfc/rfc3515). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/read-a-ladder/sources.json ## Cause The reason phrase or Q.850 cause on a failure. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3515, SIP REFER](https://www.rfc-editor.org/rfc/rfc3515). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/read-a-ladder/sources.json ## Reading a ladder One leg at a time. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3515, SIP REFER](https://www.rfc-editor.org/rfc/rfc3515). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/read-a-ladder/sources.json ## Two Call-IDs mean the trace is corrupt. False. False. A B2BUA creates two dialogs. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3515, SIP REFER](https://www.rfc-editor.org/rfc/rfc3515). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Cisco. [Understand IOS and IOS XE call routing](https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/211306-In-Depth-Explanation-of-Cisco-IOS-and-IO.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/read-a-ladder/sources.json ## SDP c= line The address where media should be sent. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - RFC. [RFC 8445, ICE](https://www.rfc-editor.org/rfc/rfc8445). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/one-way-audio/sources.json ## One-way audio Media in a single direction. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - RFC. [RFC 8445, ICE](https://www.rfc-editor.org/rfc/rfc8445). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/one-way-audio/sources.json ## One-way audio Signaling can be perfect while RTP fails in one direction. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - RFC. [RFC 8445, ICE](https://www.rfc-editor.org/rfc/rfc8445). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/one-way-audio/sources.json ## A 200 OK with SDP proves two-way audio. False. False. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - RFC. [RFC 8445, ICE](https://www.rfc-editor.org/rfc/rfc8445). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 Room or sheet file: ../rooms/sources/one-way-audio/sources.json ## MLTS A multi-line telephone system, the term the FCC page uses for enterprise and hotel phone systems. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. United States public-law text for Kari's Law. confirm. The congress.gov bill page returned a bot challenge, and the PDF text was not readable in this session. The FCC MLTS page that did open is listed separately. last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-direct/sources.json ## Dispatchable location The FCC page's term for a validated street address plus detail needed to find the caller. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. United States public-law text for Kari's Law. confirm. The congress.gov bill page returned a bot challenge, and the PDF text was not readable in this session. The FCC MLTS page that did open is listed separately. last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-direct/sources.json ## Direct dial, notification, and location This page is study material, not legal advice and not an emergency plan. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. United States public-law text for Kari's Law. confirm. The congress.gov bill page returned a bot challenge, and the PDF text was not readable in this session. The FCC MLTS page that did open is listed separately. last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-direct/sources.json ## Kari's Law, as the FCC page describes it, is satisfied by requiring users to dial 9 before 911. False. False. The page says direct dialing means no prefix or access code such as 9. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. United States public-law text for Kari's Law. confirm. The congress.gov bill page returned a bot challenge, and the PDF text was not readable in this session. The FCC MLTS page that did open is listed separately. last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-direct/sources.json ## This lab page is legal advice for every country. False. False. It is a study note about pages that were opened. Confirm the rule where you operate. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. United States public-law text for Kari's Law. confirm. The congress.gov bill page returned a bot challenge, and the PDF text was not readable in this session. The FCC MLTS page that did open is listed separately. last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-direct/sources.json ## ERL Emergency response location. The zone Emergency Responder binds to a switch port. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder product support](https://www.cisco.com/c/en/us/support/unified-communications/emergency-responder/series.html). last checked 2026-10 - Cisco. [Plan for Cisco Emergency Responder, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_01.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cer-erl-elin/sources.json ## ELIN Emergency location identification number. The callback number sent for that zone. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder product support](https://www.cisco.com/c/en/us/support/unified-communications/emergency-responder/series.html). last checked 2026-10 - Cisco. [Plan for Cisco Emergency Responder, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_01.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cer-erl-elin/sources.json ## Emergency Responder, ERL, and ELIN Cisco Emergency Responder is a separate product. The support page opened here lists Release 15 as available, with a release date of 16 October 2023. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder product support](https://www.cisco.com/c/en/us/support/unified-communications/emergency-responder/series.html). last checked 2026-10 - Cisco. [Plan for Cisco Emergency Responder, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_01.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cer-erl-elin/sources.json ## An ELIN is the caller's directory number. False. False. The CUCM chapter describes the ELIN as the number Emergency Responder uses for routing and PSAP callback, mapped back to the extension. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder product support](https://www.cisco.com/c/en/us/support/unified-communications/emergency-responder/series.html). last checked 2026-10 - Cisco. [Plan for Cisco Emergency Responder, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_01.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cer-erl-elin/sources.json ## A phone on a switch Emergency Responder does not know is still located. False. False. The planning chapter calls those phones unlocated. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder product support](https://www.cisco.com/c/en/us/support/unified-communications/emergency-responder/series.html). last checked 2026-10 - Cisco. [Plan for Cisco Emergency Responder, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_01.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/cer-erl-elin/sources.json ## PSAP Public safety answering point. The Wikipedia article describes it as the call center that answers the emergency call. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-onsite/sources.json ## On-site alert The Emergency Responder notification path named in the Release 15 administration guide. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-onsite/sources.json ## On-site alert, callback, and what this lab will not decide The Release 15 administration guide contents include on-site alerts, off-premises users, and a national E911 service provider. Those are different chapters. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-onsite/sources.json ## An outbound 911 test proves PSAP callback. False. False. Callback is a separate call toward the ELIN. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Cisco Emergency Responder Administration Guide, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15.html). last checked 2026-10 - Cisco. [Configure Cisco Unified Communications Manager, Emergency Responder 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cer/15/english/administration/guide/cer0_b_cisco-emergency-responder-administration-guide-15/cer0_b_cisco-emergency-responder-administration-guide-1401_chapter_011.html). last checked 2026-10 - FCC. [FCC, Kari's Law and RAY BAUM'S Act for multi-line telephone systems](https://www.fcc.gov/mlts-911-requirements). last checked 2026-10 - Wikipedia. [Enhanced 911 (Wikipedia)](https://en.wikipedia.org/wiki/Enhanced_9-1-1). last checked 2026-10 - Law. Emergency-calling rule outside the FCC MLTS page. confirm. No statute outside that FCC page was opened. Confirm the rule where the site operates. last checked 2026-10 Room or sheet file: ../rooms/sources/emergency-onsite/sources.json ## Built-in bridge The phone feature CUCM uses when the phone itself forks recording media. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Cisco. [Configure and troubleshoot basic call recording](https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/200788-Call-Recording-Basic-Configuration-and-T.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-phone/sources.json ## Fork A copy of the media stream sent to a recorder. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Cisco. [Configure and troubleshoot basic call recording](https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/200788-Call-Recording-Basic-Configuration-and-T.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-phone/sources.json ## Phone fork and network fork The CUCM 15 feature guide says phone-based recording takes media from the phone. The phone forks two streams to the recording server. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Cisco. [Configure and troubleshoot basic call recording](https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/200788-Call-Recording-Basic-Configuration-and-T.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-phone/sources.json ## A 200 OK proves the recorder received both audio directions. False. False. The fork is a separate media path. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Cisco. [Configure and troubleshoot basic call recording](https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/200788-Call-Recording-Basic-Configuration-and-T.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-phone/sources.json ## The built-in bridge on one phone always follows the cluster-wide parameter. False. False. The feature guide says the phone setting overrides the cluster default when default is not selected. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Cisco. [Configure and troubleshoot basic call recording](https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/200788-Call-Recording-Basic-Configuration-and-T.html). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-phone/sources.json ## SRC Session recording client. The CUBE guide says CUBE takes this role when SIPREC is configured. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 7245, architecture for media recording using SIP](https://www.rfc-editor.org/rfc/rfc7245). last checked 2026-10 - RFC. [RFC 7865, SIP recording metadata](https://www.rfc-editor.org/rfc/rfc7865). last checked 2026-10 - RFC. [RFC 7866, session recording protocol](https://www.rfc-editor.org/rfc/rfc7866). last checked 2026-10 - Cisco. [CUBE configuration guide, SIP forking (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_voi-cube-sip-rec-recorder.html). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-siprec/sources.json ## SRS Session recording server. RFC 7865 describes metadata from the server's point of view. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 7245, architecture for media recording using SIP](https://www.rfc-editor.org/rfc/rfc7245). last checked 2026-10 - RFC. [RFC 7865, SIP recording metadata](https://www.rfc-editor.org/rfc/rfc7865). last checked 2026-10 - RFC. [RFC 7866, session recording protocol](https://www.rfc-editor.org/rfc/rfc7866). last checked 2026-10 - Cisco. [CUBE configuration guide, SIP forking (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_voi-cube-sip-rec-recorder.html). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-siprec/sources.json ## SIPREC and CUBE as the recording client RFC 7245 describes architectures for recording in a SIP environment by sending a copy of a media stream to a recording device. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 7245, architecture for media recording using SIP](https://www.rfc-editor.org/rfc/rfc7245). last checked 2026-10 - RFC. [RFC 7865, SIP recording metadata](https://www.rfc-editor.org/rfc/rfc7865). last checked 2026-10 - RFC. [RFC 7866, session recording protocol](https://www.rfc-editor.org/rfc/rfc7866). last checked 2026-10 - Cisco. [CUBE configuration guide, SIP forking (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_voi-cube-sip-rec-recorder.html). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-siprec/sources.json ## The recording INVITE is the same dialog as the call being recorded. False. False. SIPREC is a separate recording session. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 7245, architecture for media recording using SIP](https://www.rfc-editor.org/rfc/rfc7245). last checked 2026-10 - RFC. [RFC 7865, SIP recording metadata](https://www.rfc-editor.org/rfc/rfc7865). last checked 2026-10 - RFC. [RFC 7866, session recording protocol](https://www.rfc-editor.org/rfc/rfc7866). last checked 2026-10 - Cisco. [CUBE configuration guide, SIP forking (IOS XE 17.6 onwards)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/ios-xe/config/ios-xe-book/m_voi-cube-sip-rec-recorder.html). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 Room or sheet file: ../rooms/sources/recording-siprec/sources.json ## Recording file The stored copy of the media. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 7245, architecture for media recording using SIP](https://www.rfc-editor.org/rfc/rfc7245). last checked 2026-10 - RFC. [RFC 7866, session recording protocol](https://www.rfc-editor.org/rfc/rfc7866). last checked 2026-10 - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Law. Call-recording consent and retention rule. confirm. No privacy or retention statute was opened. RFC 7245 names compliance as a reason some sites record. It does not say which rule applies to you. last checked 2026-10 Room or sheet file: ../rooms/sources/recording-compliance/sources.json ## Quality score A review of a call. It is not the media file. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 7245, architecture for media recording using SIP](https://www.rfc-editor.org/rfc/rfc7245). last checked 2026-10 - RFC. [RFC 7866, session recording protocol](https://www.rfc-editor.org/rfc/rfc7866). last checked 2026-10 - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Law. Call-recording consent and retention rule. confirm. No privacy or retention statute was opened. RFC 7245 names compliance as a reason some sites record. It does not say which rule applies to you. last checked 2026-10 Room or sheet file: ../rooms/sources/recording-compliance/sources.json ## Compliance is a reason, not a setting RFC 7245 says some environments record every call for regulatory, compliance, and consumer-protection reasons. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 7245, architecture for media recording using SIP](https://www.rfc-editor.org/rfc/rfc7245). last checked 2026-10 - RFC. [RFC 7866, session recording protocol](https://www.rfc-editor.org/rfc/rfc7866). last checked 2026-10 - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Law. Call-recording consent and retention rule. confirm. No privacy or retention statute was opened. RFC 7245 names compliance as a reason some sites record. It does not say which rule applies to you. last checked 2026-10 Room or sheet file: ../rooms/sources/recording-compliance/sources.json ## RFC 7245 chooses the retention period for your contact center. False. False. It explains recording architectures. It does not set your policy. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 7245, architecture for media recording using SIP](https://www.rfc-editor.org/rfc/rfc7245). last checked 2026-10 - RFC. [RFC 7866, session recording protocol](https://www.rfc-editor.org/rfc/rfc7866). last checked 2026-10 - Cisco. [Feature Configuration Guide for CUCM, Release 15, Recording](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_r53f7ff4_00_recording-12-0.html). last checked 2026-10 - Law. Call-recording consent and retention rule. confirm. No privacy or retention statute was opened. RFC 7245 names compliance as a reason some sites record. It does not say which rule applies to you. last checked 2026-10 Room or sheet file: ../rooms/sources/recording-compliance/sources.json ## SIP trunk The signaling peer between two call agents or between a PBX and a provider. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [SIP trunking (Wikipedia)](https://en.wikipedia.org/wiki/SIP_trunking). last checked 2026-10 - SIP Forum. [SIPconnect technical recommendation](https://www.sipforum.org/technology/sipconnect/). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/open-sip-trunk/sources.json ## SIPconnect The SIP Forum's technical recommendation for IP peering with a VoIP provider. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [SIP trunking (Wikipedia)](https://en.wikipedia.org/wiki/SIP_trunking). last checked 2026-10 - SIP Forum. [SIPconnect technical recommendation](https://www.sipforum.org/technology/sipconnect/). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/open-sip-trunk/sources.json ## A SIP trunk is a peer, not a brand Wikipedia's SIP trunking article describes a SIP service between a provider and a customer's SIP PBX. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [SIP trunking (Wikipedia)](https://en.wikipedia.org/wiki/SIP_trunking). last checked 2026-10 - SIP Forum. [SIPconnect technical recommendation](https://www.sipforum.org/technology/sipconnect/). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/open-sip-trunk/sources.json ## One SIP trunk means both PBXs share one dial plan. False. False. Each side matches the digits with its own rules. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [SIP trunking (Wikipedia)](https://en.wikipedia.org/wiki/SIP_trunking). last checked 2026-10 - SIP Forum. [SIPconnect technical recommendation](https://www.sipforum.org/technology/sipconnect/). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 Room or sheet file: ../rooms/sources/open-sip-trunk/sources.json ## Dialplan The Asterisk or FreeSWITCH rules that match a call. Not a CUCM CSS. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [Asterisk (Wikipedia)](https://en.wikipedia.org/wiki/Asterisk_(PBX)). last checked 2026-10 - Asterisk. [Types of Asterisk modules](https://docs.asterisk.org/Fundamentals/Asterisk-Architecture/Types-of-Asterisk-Modules/). last checked 2026-10 - Asterisk. [Configuring res_pjsip](https://docs.asterisk.org/Configuration/Channel-Drivers/SIP/Configuring-res_pjsip/). last checked 2026-10 - Wikipedia. [FreeSWITCH (Wikipedia)](https://en.wikipedia.org/wiki/FreeSWITCH). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 Room or sheet file: ../rooms/sources/asterisk-freeswitch/sources.json ## res_pjsip The Asterisk SIP channel stack named in the documentation opened for this lab. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [Asterisk (Wikipedia)](https://en.wikipedia.org/wiki/Asterisk_(PBX)). last checked 2026-10 - Asterisk. [Types of Asterisk modules](https://docs.asterisk.org/Fundamentals/Asterisk-Architecture/Types-of-Asterisk-Modules/). last checked 2026-10 - Asterisk. [Configuring res_pjsip](https://docs.asterisk.org/Configuration/Channel-Drivers/SIP/Configuring-res_pjsip/). last checked 2026-10 - Wikipedia. [FreeSWITCH (Wikipedia)](https://en.wikipedia.org/wiki/FreeSWITCH). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 Room or sheet file: ../rooms/sources/asterisk-freeswitch/sources.json ## Asterisk and FreeSWITCH as the other PBX Wikipedia describes Asterisk as a software PBX that connects phones, the PSTN, and VoIP endpoints. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [Asterisk (Wikipedia)](https://en.wikipedia.org/wiki/Asterisk_(PBX)). last checked 2026-10 - Asterisk. [Types of Asterisk modules](https://docs.asterisk.org/Fundamentals/Asterisk-Architecture/Types-of-Asterisk-Modules/). last checked 2026-10 - Asterisk. [Configuring res_pjsip](https://docs.asterisk.org/Configuration/Channel-Drivers/SIP/Configuring-res_pjsip/). last checked 2026-10 - Wikipedia. [FreeSWITCH (Wikipedia)](https://en.wikipedia.org/wiki/FreeSWITCH). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 Room or sheet file: ../rooms/sources/asterisk-freeswitch/sources.json ## An Asterisk dialplan is a CUCM calling search space. False. False. It is a different object on a different product. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [Asterisk (Wikipedia)](https://en.wikipedia.org/wiki/Asterisk_(PBX)). last checked 2026-10 - Asterisk. [Types of Asterisk modules](https://docs.asterisk.org/Fundamentals/Asterisk-Architecture/Types-of-Asterisk-Modules/). last checked 2026-10 - Asterisk. [Configuring res_pjsip](https://docs.asterisk.org/Configuration/Channel-Drivers/SIP/Configuring-res_pjsip/). last checked 2026-10 - Wikipedia. [FreeSWITCH (Wikipedia)](https://en.wikipedia.org/wiki/FreeSWITCH). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 Room or sheet file: ../rooms/sources/asterisk-freeswitch/sources.json ## WebRTC Browser real-time communication. The W3C recommendation is the API. RFC 8825 points at the protocol suite. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [WebRTC (Wikipedia)](https://en.wikipedia.org/wiki/WebRTC). last checked 2026-10 - WebRTC. [W3C WebRTC recommendation](https://www.w3.org/TR/webrtc/). last checked 2026-10 - RFC. [RFC 8825, WebRTC protocol overview](https://www.rfc-editor.org/rfc/rfc8825). last checked 2026-10 - RFC. [RFC 8829, JavaScript session establishment](https://www.rfc-editor.org/rfc/rfc8829). last checked 2026-10 - RFC. [RFC 7118, SIP over WebSocket](https://www.rfc-editor.org/rfc/rfc7118). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - WebRTC. CPaaS vendor matrix. confirm. No vendor matrix was opened. The FreeSWITCH manual notes one hosted platform. Confirm any other vendor on that vendor's own page. last checked 2026-10 Room or sheet file: ../rooms/sources/webrtc-bridge/sources.json ## JSEP JavaScript Session Establishment Protocol, RFC 8829. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [WebRTC (Wikipedia)](https://en.wikipedia.org/wiki/WebRTC). last checked 2026-10 - WebRTC. [W3C WebRTC recommendation](https://www.w3.org/TR/webrtc/). last checked 2026-10 - RFC. [RFC 8825, WebRTC protocol overview](https://www.rfc-editor.org/rfc/rfc8825). last checked 2026-10 - RFC. [RFC 8829, JavaScript session establishment](https://www.rfc-editor.org/rfc/rfc8829). last checked 2026-10 - RFC. [RFC 7118, SIP over WebSocket](https://www.rfc-editor.org/rfc/rfc7118). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - WebRTC. CPaaS vendor matrix. confirm. No vendor matrix was opened. The FreeSWITCH manual notes one hosted platform. Confirm any other vendor on that vendor's own page. last checked 2026-10 Room or sheet file: ../rooms/sources/webrtc-bridge/sources.json ## WebRTC, SIP over WebSocket, and a hosted bridge Wikipedia describes WebRTC as browser and mobile APIs for real-time audio and video without a plugin. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [WebRTC (Wikipedia)](https://en.wikipedia.org/wiki/WebRTC). last checked 2026-10 - WebRTC. [W3C WebRTC recommendation](https://www.w3.org/TR/webrtc/). last checked 2026-10 - RFC. [RFC 8825, WebRTC protocol overview](https://www.rfc-editor.org/rfc/rfc8825). last checked 2026-10 - RFC. [RFC 8829, JavaScript session establishment](https://www.rfc-editor.org/rfc/rfc8829). last checked 2026-10 - RFC. [RFC 7118, SIP over WebSocket](https://www.rfc-editor.org/rfc/rfc7118). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - WebRTC. CPaaS vendor matrix. confirm. No vendor matrix was opened. The FreeSWITCH manual notes one hosted platform. Confirm any other vendor on that vendor's own page. last checked 2026-10 Room or sheet file: ../rooms/sources/webrtc-bridge/sources.json ## A WebRTC page is a CUCM SIP phone. False. False. Something has to translate, unless the far end also speaks WebRTC. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [WebRTC (Wikipedia)](https://en.wikipedia.org/wiki/WebRTC). last checked 2026-10 - WebRTC. [W3C WebRTC recommendation](https://www.w3.org/TR/webrtc/). last checked 2026-10 - RFC. [RFC 8825, WebRTC protocol overview](https://www.rfc-editor.org/rfc/rfc8825). last checked 2026-10 - RFC. [RFC 8829, JavaScript session establishment](https://www.rfc-editor.org/rfc/rfc8829). last checked 2026-10 - RFC. [RFC 7118, SIP over WebSocket](https://www.rfc-editor.org/rfc/rfc7118). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - WebRTC. CPaaS vendor matrix. confirm. No vendor matrix was opened. The FreeSWITCH manual notes one hosted platform. Confirm any other vendor on that vendor's own page. last checked 2026-10 Room or sheet file: ../rooms/sources/webrtc-bridge/sources.json ## RFC 8829 replaces SIP. False. False. It describes JavaScript control of the signaling plane and how that relates to existing signaling. ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - Wikipedia. [WebRTC (Wikipedia)](https://en.wikipedia.org/wiki/WebRTC). last checked 2026-10 - WebRTC. [W3C WebRTC recommendation](https://www.w3.org/TR/webrtc/). last checked 2026-10 - RFC. [RFC 8825, WebRTC protocol overview](https://www.rfc-editor.org/rfc/rfc8825). last checked 2026-10 - RFC. [RFC 8829, JavaScript session establishment](https://www.rfc-editor.org/rfc/rfc8829). last checked 2026-10 - RFC. [RFC 7118, SIP over WebSocket](https://www.rfc-editor.org/rfc/rfc7118). last checked 2026-10 - FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10 - WebRTC. CPaaS vendor matrix. confirm. No vendor matrix was opened. The FreeSWITCH manual notes one hosted platform. Confirm any other vendor on that vendor's own page. last checked 2026-10 Room or sheet file: ../rooms/sources/webrtc-bridge/sources.json ## Sources and go deeper Independent, free, learning-only student project. Opened 2026-10. A row marked confirm has no link, because that page was not verified. - RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10 - RFC. [RFC 3264, offer/answer](https://www.rfc-editor.org/rfc/rfc3264). last checked 2026-10 - RFC. [RFC 3550, RTP](https://www.rfc-editor.org/rfc/rfc3550). last checked 2026-10 - RFC. [RFC 4566, SDP](https://www.rfc-editor.org/rfc/rfc4566). last checked 2026-10 - RFC. [RFC 3711, SRTP](https://www.rfc-editor.org/rfc/rfc3711). last checked 2026-10 - Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10 - Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10 - Cisco. [Cisco Collaboration Preferred Architectures](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/PAdocs.html). last checked 2026-10 - Cisco. [Preferred Architecture for Cisco Collaboration 15, design overview (PDF)](https://www.cisco.com/c/dam/en/us/td/docs/solutions/PA/overview/15x/clbpa15x.pdf). last checked 2026-10 - Cisco. [Cisco Unified Border Element product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-border-element/series.html). last checked 2026-10 - Protocol and ports. [CUCM 15 TCP and UDP port usage](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_m_tcp-and-udp-port-usage-12-0.html). last checked 2026-10 - Protocol and ports. [Cisco Expressway IP port usage (X14.3 and X15.0)](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15.html). last checked 2026-10 - Protocol and ports. [Port reference for Webex Calling](https://help.webex.com/en-us/article/b2exve/Port-Reference-Information-for-Cisco-Webex-Calling). last checked 2026-10 - Protocol and ports. [IANA SIP parameters](https://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA RTP parameters](https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml). last checked 2026-10 - Protocol and ports. [IANA service names and port numbers](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). last checked 2026-10 - Community. [Cisco Community, Collaboration knowledge base](https://community.cisco.com/t5/collaboration-knowledge-base/tkb-p/4691-docs-collaboration-voice-video). last checked 2026-10 - Wikipedia. [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol). last checked 2026-10 - Wikipedia. [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol). last checked 2026-10 - Wikipedia. [Session Description Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Description_Protocol). last checked 2026-10 - Wikipedia. [Voice over IP (Wikipedia)](https://en.wikipedia.org/wiki/Voice_over_IP). last checked 2026-10 - Cisco. Collaboration 12 SRND book. confirm. The historical Collaboration 12 SRND path opened as a product listing, not the design book. Use the Preferred Architecture index, which was opened. last checked 2026-10 - Cisco. Enterprise QoS SRND book. confirm. The Enterprise QoS SRND path returned HTTP 404. last checked 2026-10 - Wikipedia. English Wikipedia article for Cisco Unified Communications Manager. confirm. That title returned HTTP 404. The CUCM disambiguation page is the Wikipedia page that opened. last checked 2026-10 Room or sheet file: sources/flashcards/sources.json