Downloads
Cheat codes
Flip a card. The back is the short read. The sheet, PDF, and PNG are the one-page files. Vendor books stay at the links on each study page.
Ports and protocolsFlip5060 SIP, 5061 TLS, 2000 SCCP, 69 TFTP, 6970 HTTP. From the CUCM 15 port chapter.Sheet 路 PDF 路 PNG
Firewall matrixFlipPhones to CUCM, gateways, applications, then CUCM outward. The matrix is the sheet, not a live ACL.Sheet 路 PDF 路 PNG
Call flowsFlipREGISTER stores a binding. The call is not up until ACK. A 200 OK is not audio.Sheet 路 PDF 路 PNG
Configuration checklistFlipLine CSS before device CSS. Early offer is SDP in the INVITE. Delayed offer is SDP in the 200.Sheet 路 PDF 路 PNG
Troubleshooting treeFlipOne leg, one identifier, one change, then the capture. Reorder outside is often CSS before CUBE.Sheet 路 PDF 路 PNG
GlossaryFlipCSS, partition, dial-peer 0, early offer, B2BUA, ELIN, call type, EF 46.Sheet 路 PDF 路 PNG
PSTN optionsFlipCUCM trunk, Webex Calling Plan or local gateway, Teams Calling Plan or Operator Connect or Direct Routing.Sheet 路 PDF 路 PNG
EmergencyFlipDirect 911 in the US. Callback must return to the site that dialed. Name the product before the test.Sheet 路 PDF 路 PNG
QoSFlipVoice RTP is commonly EF 46. Cisco signaling designs often use CS3. RFC 4594 assigns signaling CS5.Sheet 路 PDF 路 PNG
CutoverFlipDiscover, normalize to +E.164, canary including callback, write the rollback, stop if proof is missing.Sheet 路 PDF 路 PNG
SecurityFlipTLS locks signaling. SRTP locks audio. 8090 is gateway recording HTTP. Consent is not a port.Sheet 路 PDF 路 PNG
Flashcard files
- Cited deck JSON 路 88 cards
- Idea-pool deck JSON 路 1384 cards
- Printable twelve
Full offline bundle
Older October study PDFs remain in the download folder: SIP, SDP, dial plan, CUBE, E911, QoS, and migration.
Sources and go deeper
Opened 2026-10. A row marked confirm has no link, because that page was not verified.
- RFC. RFC 3261, SIP last checked 2026-10
- RFC. RFC 3264, offer/answer last checked 2026-10
- RFC. RFC 3550, RTP last checked 2026-10
- RFC. RFC 4566, SDP last checked 2026-10
- RFC. RFC 3711, SRTP last checked 2026-10
- Cisco. Cisco Unified Communications Manager product support last checked 2026-10
- Cisco. System Configuration Guide for CUCM, Release 15 last checked 2026-10
- Cisco. Cisco Collaboration Preferred Architectures last checked 2026-10
- Cisco. Preferred Architecture for Cisco Collaboration 15, design overview (PDF) last checked 2026-10
- Cisco. Cisco Unified Border Element product support last checked 2026-10
- Protocol and ports. CUCM 15 TCP and UDP port usage last checked 2026-10
- Protocol and ports. Cisco Expressway IP port usage (X14.3 and X15.0) last checked 2026-10
- Protocol and ports. Port reference for Webex Calling last checked 2026-10
- Protocol and ports. IANA SIP parameters last checked 2026-10
- Protocol and ports. IANA RTP parameters last checked 2026-10
- Protocol and ports. IANA service names and port numbers last checked 2026-10
- Community. Cisco Community, Collaboration knowledge base last checked 2026-10
- Wikipedia. Session Initiation Protocol (Wikipedia) last checked 2026-10
- Wikipedia. Real-time Transport Protocol (Wikipedia) last checked 2026-10
- Wikipedia. Session Description Protocol (Wikipedia) last checked 2026-10
- Wikipedia. Voice over IP (Wikipedia) 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