Source note · SIP trunk redundancy and failover design
CUCM SIPTrunkOOS reason codes distinguish request timeout (Local=1), inability of the local SIP stack to create a socket connection (Local=2) and DNS query failure (Local=3).
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- SIP trunk OPTIONS ping
- Deployment
- on-premises
- Region
- not restricted
- Release range
- not version-scoped; technote dated 2019-02-06
- Checked
- 2026-09-25
Sources
- Configure Options Ping Between CUCM and CUBE — Cisco · tier 2 current vendor documentation · Troubleshoot section
Cite this note
APA
WarmTransfer. (2026, September 25). SIP trunk redundancy and failover design: source note sip-trunk-redundancy-design-cucm-oos-reasons. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-trunk-redundancy-design-cucm-oos-reasons
BibTeX
@misc{warmtransfer-claim-sip-trunk-redundancy-design-cucm-oos-reasons,
title = {SIP trunk redundancy and failover design: source note sip-trunk-redundancy-design-cucm-oos-reasons},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-trunk-redundancy-design-cucm-oos-reasons},
note = {Source note sip-trunk-redundancy-design-cucm-oos-reasons, checked 2026-09-25}
}