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Opened 2026-10. A row marked confirm has no link, because that page was not verified.

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
Protocol and ports. CUCM 15 TCP and UDP port usage last checked 2026-10
Protocol and ports. IANA SIP parameters last checked 2026-10
Community. Cisco Community, Collaboration knowledge base last checked 2026-10
Wikipedia. Voice over IP (Wikipedia) last checked 2026-10
Wikipedia. CUCM (Wikipedia disambiguation) 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