Unified CM can append :5060 or :5061 to the destination URI, which makes the Expressway query A/AAAA instead of SRV records; a transform on Expressway-C that removes the port fixes this.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- transforms
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Expressway X8.1.1 or later
- Checked
- 2026-09-25
Sources
- Troubleshoot Most Common Issues for Business to Business Calls Through Expressway — Cisco Systems · tier 2 current vendor documentation · Issue: DNS resolution fails for FQDN with port
Cite this note
APA
WarmTransfer. (2026, September 25). Setting up business-to-business calling on Cisco Expressway: source note expressway-b2b-setup-port-strip-transform. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-setup-port-strip-transform
BibTeX
@misc{warmtransfer-claim-expressway-b2b-setup-port-strip-transform,
title = {Setting up business-to-business calling on Cisco Expressway: source note expressway-b2b-setup-port-strip-transform},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-setup-port-strip-transform},
note = {Source note expressway-b2b-setup-port-strip-transform, checked 2026-09-25}
}