Unified CM SIP trunk daemons accept inbound calls only from end systems whose IP addresses are defined in the trunk's destination address fields.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- SIP trunk
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 8.6(1) design guidance; later releases not verified
- Checked
- 2026-10-02
Sources
- Cisco Unified Communications Manager Trunks (Session Management Edition deployment guide 8.6(1)) — Cisco · tier 2 current vendor documentation · SIP trunk section (inbound call acceptance)
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-inbound-src-ip. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-inbound-src-ip
BibTeX
@misc{warmtransfer-claim-cucm-sip-trunk-no-service-troubleshooting-inbound-src-ip,
title = {Troubleshooting Unified CM SIP trunks that show No Service: source note cucm-sip-trunk-no-service-troubleshooting-inbound-src-ip},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-sip-trunk-no-service-troubleshooting-inbound-src-ip},
note = {Source note cucm-sip-trunk-no-service-troubleshooting-inbound-src-ip, checked 2026-10-02}
}