SRST when CUCM is unreachable

Sources and go deeper

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

Cisco. Cisco Unified SRST product support 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
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. Voice over IP (Wikipedia) last checked 2026-10
Wikipedia. English Wikipedia article for Survivable Remote Site Telephony. confirm. That title returned HTTP 404. last checked 2026-10