Cheat code
PSTN cheat sheet
- CUCM: SIP trunk, MGCP, H.323, or ICT. CUBE is a B2BUA in front of a carrier you keep.
- Webex Calling: Calling Plan, or local gateway. Not both for one location.
- Teams: Calling Plan, Operator Connect, or Direct Routing.
- Bring your own carrier: your contract, your SBC, their call control.
Sources: Webex Calling help, Direct Routing plan, RFC 3261.
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
- Webex. Get started with Webex Calling last checked 2026-10
- Webex. Get started with Local Gateway last checked 2026-10
- Cisco. Cisco Unified Border Element product support last checked 2026-10
- Community. Cisco Community, Collaboration knowledge base last checked 2026-10
- Wikipedia. Voice over IP (Wikipedia) last checked 2026-10