Source note · Troubleshooting Expressway Mobile and Remote Access
MRA endpoints can fail to register when a SIP trunk exists between Unified CM and Expressway-C; the fix is a trunk listening port on Unified CM different from the SIP line registration port.
Checked 2026-10-01
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- registration
- Deployment
- on-premises
- Region
- not restricted
- Release range
- X15.2 documentation
- Checked
- 2026-10-01
Sources
- Mobile and Remote Access Through Cisco Expressway Deployment Guide (X15.2) - MRA Troubleshooting — Cisco Systems · tier 2 current vendor documentation · Registration Issues > Endpoints Cannot Register to Unified CM
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting Expressway Mobile and Remote Access: source note expressway-mra-troubleshooting-sip-trunk-port-conflict. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-mra-troubleshooting-sip-trunk-port-conflict
BibTeX
@misc{warmtransfer-claim-expressway-mra-troubleshooting-sip-trunk-port-conflict,
title = {Troubleshooting Expressway Mobile and Remote Access: source note expressway-mra-troubleshooting-sip-trunk-port-conflict},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-mra-troubleshooting-sip-trunk-port-conflict},
note = {Source note expressway-mra-troubleshooting-sip-trunk-port-conflict, checked 2026-10-01}
}