When all destinations of a SIP trunk are unreachable, Unified CM considers the SIP trunk out of service.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- SIP OPTIONS ping
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 8.5(1) design guidance; later releases not verified
- Checked
- 2026-10-02
Sources
- Cisco Unified Communications Manager Trunks (Session Management Edition deployment guide, Release 8.5(1)) — Cisco Systems · tier 2 current vendor documentation · SIP OPTIONS Ping
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Unified CM SIP trunks that show No Service: source note cucm-sip-trunk-no-service-troubleshooting-all-dest-oos. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-all-dest-oos
BibTeX
@misc{warmtransfer-claim-cucm-sip-trunk-no-service-troubleshooting-all-dest-oos,
title = {Troubleshooting Unified CM SIP trunks that show No Service: source note cucm-sip-trunk-no-service-troubleshooting-all-dest-oos},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-all-dest-oos},
note = {Source note cucm-sip-trunk-no-service-troubleshooting-all-dest-oos, checked 2026-10-02}
}