# PSTN, BYOC, and trunks

PSTN, BYOC, and trunks Bring-your-own carrier in this lab means premises PSTN on a Local Gateway, or Cloud Connected PSTN where a partner is the carrier. It is not a fourth mystery option. Item What to remember Source Per location One connection type. t9xctu Cisco Calling Plan Cisco is the carrier. T2-R02 Cloud Connected PSTN A certified partner carrier. T2-R02 Premises Your trunk, your carrier, CUBE as the usual local gateway. t9xctu Registration cap The Canon records 250 concurrent calls and CUBE only for registration trunks. T2-R02 Back to the lab

## Sources and go deeper

Checked links were opened this month. A confirm row has no address because that page was not opened.

- Wikipedia: [Webex (Wikipedia)](https://en.wikipedia.org/wiki/Webex) — last checked 2026-10
- Vendor doc: [Webex Help Center](https://help.webex.com/) — last checked 2026-10
- DevDocs: [Webex developer documentation](https://developer.webex.com/) — last checked 2026-10
- DevDocs: [Webex developer getting started](https://developer.webex.com/docs/getting-started) — last checked 2026-10
- Community: [Webex community](https://help.webex.com/community) — last checked 2026-10
- SRND: [Cisco Collaboration design zone](https://www.cisco.com/c/en/us/solutions/enterprise/design-zone-collaboration/index.html) — last checked 2026-10
- RFC: [RFC 3261 SIP: Session Initiation Protocol](https://www.rfc-editor.org/rfc/rfc3261) — last checked 2026-10
- Port table: [IANA service name and port number registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) — last checked 2026-10
- Port table: [Port reference for Webex Calling](https://help.webex.com/article/b2exve) — last checked 2026-10
- RFC: [RFC 3263 Locating SIP Servers](https://www.rfc-editor.org/rfc/rfc3263) — last checked 2026-10
- RFC: [RFC 3264 An Offer/Answer Model with SDP](https://www.rfc-editor.org/rfc/rfc3264) — last checked 2026-10
- Wikipedia: [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol) — 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
- RFC: [RFC 4566 SDP](https://www.rfc-editor.org/rfc/rfc4566) — last checked 2026-10
- RFC: [RFC 4733 RTP payload for DTMF](https://www.rfc-editor.org/rfc/rfc4733) — last checked 2026-10
- Wikipedia: [Real-time Transport Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol) — last checked 2026-10
- Release notes: [What's new in Webex Calling](https://help.webex.com/article/278bz2) — last checked 2026-10
- Vendor doc: [help.webex.com article njvdjf2](https://help.webex.com/en-us/article/njvdjf2/Configure-Webex-Calling-for-your-organization) — last checked 2026-10
- Vendor doc: [help.webex.com article n0xb944](https://help.webex.com/article/n0xb944) — last checked 2026-10
- Vendor doc: [help.webex.com article t9xctu](https://help.webex.com/en-us/article/t9xctu/Get-started-with-Local-Gateway) — last checked 2026-10
- Vendor doc: [help.webex.com article jr1i3r](https://help.webex.com/en-us/article/jr1i3r) — last checked 2026-10
- Vendor doc: [ciscolive.com global-event 2025 PDF](https://www.ciscolive.com/c/dam/r/ciscolive/global-event/docs/2025/pdf/BRKCOL-2312.pdf) — last checked 2026-10
- Vendor doc: [help.webex.com article nousk9ab](https://help.webex.com/article/nousk9ab) — last checked 2026-10
- Vendor doc: [webex.com content dam … cm-5770.pdf](https://www.webex.com/content/dam/wbx/us/aag/webex_calling_pstn_options_cm-5770.pdf) — last checked 2026-10
- Vendor doc: [help.webex.com article noei0ug](https://help.webex.com/article/noei0ug) — last checked 2026-10
- Vendor doc: [ciscolive.com global-event 2024 PDF](https://www.ciscolive.com/c/dam/r/ciscolive/global-event/docs/2024/pdf/BRKCOL-2812.pdf) — last checked 2026-10
- Vendor doc: [help.webex.com article jwkbt2](https://help.webex.com/article/jwkbt2) — last checked 2026-10
- Vendor doc: [help.webex.com article n4cprps](https://help.webex.com/en-us/article/n4cprps/Prepare-Your-Environment-for-Webex-Calling) — last checked 2026-10
- Vendor doc: [help.webex.com article utqcm7](https://help.webex.com/article/utqcm7) — last checked 2026-10
- Vendor doc: [help.webex.com article nmhk7ve](https://help.webex.com/article/nmhk7ve/Webex-Dedicated-Instance-Contact-Center-integration) — last checked 2026-10
- Vendor doc: [help.webex.com article av6oo3](https://help.webex.com/article/av6oo3) — last checked 2026-10
- Vendor doc: [help.webex.com article nj0abhbb](https://help.webex.com/article/nj0abhbb) — last checked 2026-10
- Vendor doc: [help.webex.com article nhvl4hw](https://help.webex.com/article/nhvl4hw) — last checked 2026-10
- Vendor doc: [developer.webex.com calling emergency-services-settings](https://developer.webex.com/calling/docs/api/v1/emergency-services-settings) — last checked 2026-10
- Vendor doc: [developer.webex.com calling call-control](https://developer.webex.com/calling/docs/call-control) — last checked 2026-10
- Vendor doc: [list events](https://developer.webex.com/admin/docs/api/v1/events/list-events) — last checked 2026-10
- Vendor doc: [help.webex.com article nbedetf](https://help.webex.com/article/nbedetf) — last checked 2026-10
- Vendor doc: [help.webex.com article n1ku0vfb](https://help.webex.com/article/n1ku0vfb) — last checked 2026-10
- Vendor doc: [help.webex.com article nvfbjts](https://help.webex.com/article/nvfbjts) — last checked 2026-10
- Vendor doc: [help.webex.com article mwjlgk](https://help.webex.com/article/mwjlgk) — last checked 2026-10

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