When OPTIONS ping is enabled in the SIP Profile, Unified CM sends SIP OPTIONS messages to the trunk peer and a successful response indicates the trunk is in service.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- SIP OPTIONS ping
- Deployment
- on-premises
- Region
- not restricted
- Release range
- technote updated 2018-09-26; release not stated
- Checked
- 2026-10-02
Sources
- Calls through Session Initiation Protocol (SIP) Trunk Failure — Cisco · tier 2 current vendor documentation · Background Information
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-options-in-service. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-options-in-service
BibTeX
@misc{warmtransfer-claim-cucm-sip-trunk-no-service-troubleshooting-options-in-service,
title = {Troubleshooting Unified CM SIP trunks that show No Service: source note cucm-sip-trunk-no-service-troubleshooting-options-in-service},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-options-in-service},
note = {Source note cucm-sip-trunk-no-service-troubleshooting-options-in-service, checked 2026-10-02}
}