Source note · SIP 503 and trunk out-of-service failures
In Unified CM, OPTIONS Ping is enabled on the SIP Profile (Device > Device Settings > SIP Profile) assigned to the SIP trunk, and the CUBE side uses voice-class sip options-keepalive on the dial peer.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- SIP trunk OPTIONS ping
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as documented in 2019 tech note
- Checked
- 2026-09-25
Sources
- Configure Options Ping Between CUCM and CUBE — Cisco · tier 2 current vendor documentation · Configure section (CUCM SIP Profile and CUBE dial-peer steps)
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 503 and trunk out-of-service failures: source note sip-503-trunk-failures-cucm-enable-sip-profile. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-503-trunk-failures-cucm-enable-sip-profile
BibTeX
@misc{warmtransfer-claim-sip-503-trunk-failures-cucm-enable-sip-profile,
title = {SIP 503 and trunk out-of-service failures: source note sip-503-trunk-failures-cucm-enable-sip-profile},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-503-trunk-failures-cucm-enable-sip-profile},
note = {Source note sip-503-trunk-failures-cucm-enable-sip-profile, checked 2026-09-25}
}