Cheat code
Glossary cheat sheet
- CSS — ordered partitions. Line, then device.
- Dial-peer 0 — no inbound peer matched.
- Early offer — SDP in INVITE. Delayed offer — SDP in the 200.
- B2BUA — two legs. Read both.
- ELIN — callback identity for the site that called emergency services.
- Call type — UCCE report bucket selected by the dialed number.
- EF 46 — voice RTP mark. Still needs a priority queue.
Terms used in this lab. Port numbers still come from the CUCM 15 port chapter.
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
- Cisco. System Configuration Guide for CUCM, Release 15 last checked 2026-10
- Protocol and ports. CUCM 15 TCP and UDP port usage last checked 2026-10
- Community. Cisco Community, Collaboration knowledge base last checked 2026-10
- Wikipedia. Session Initiation Protocol (Wikipedia) last checked 2026-10
- Wikipedia. Voice over IP (Wikipedia) last checked 2026-10