With SIP OPTIONS ping, a trunk destination address is considered out of service if it does not respond to an OPTIONS request, answers 503 Service Unavailable or 408 Request Timeout, or a TCP connection cannot be established.
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) and 8.6(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-oos-triggers. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-oos-triggers
BibTeX
@misc{warmtransfer-claim-cucm-sip-trunk-no-service-troubleshooting-oos-triggers,
title = {Troubleshooting Unified CM SIP trunks that show No Service: source note cucm-sip-trunk-no-service-troubleshooting-oos-triggers},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-oos-triggers},
note = {Source note cucm-sip-trunk-no-service-troubleshooting-oos-triggers, checked 2026-10-02}
}