Source note · SIP OPTIONS pings and trunk keepalives
When every remote peer of a SIP trunk is out of service, Unified CM reports that all remote peers are out of service and cannot handle calls for the trunk, and the trunk shows No Service.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- SIP trunk
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as documented 2018
- Checked
- 2026-09-24
Sources
- Calls through Session Initiation Protocol (SIP) Trunk Failure — Cisco · tier 2 current vendor documentation · problem description and trunk status discussion
Cite this note
APA
WarmTransfer. (2026, September 24). SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-cucm-all-peers-oos-alert. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-options-keepalive-cucm-all-peers-oos-alert
BibTeX
@misc{warmtransfer-claim-sip-options-keepalive-cucm-all-peers-oos-alert,
title = {SIP OPTIONS pings and trunk keepalives: source note sip-options-keepalive-cucm-all-peers-oos-alert},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-options-keepalive-cucm-all-peers-oos-alert},
note = {Source note sip-options-keepalive-cucm-all-peers-oos-alert, checked 2026-09-24}
}