Cisco recommends enabling SIP OPTIONS ping on all SIP trunks so Unified CM tracks trunk state dynamically rather than per call and by timeout.
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-ping-recommended. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-ping-recommended
BibTeX
@misc{warmtransfer-claim-cucm-sip-trunk-no-service-troubleshooting-ping-recommended,
title = {Troubleshooting Unified CM SIP trunks that show No Service: source note cucm-sip-trunk-no-service-troubleshooting-ping-recommended},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-ping-recommended},
note = {Source note cucm-sip-trunk-no-service-troubleshooting-ping-recommended, checked 2026-10-02}
}