Source note · Expressway business-to-business calling
SIP over UDP is disabled by default on the Expressway, so a published _sip._udp record does not work unless UDP is enabled.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- SIP transport
- Deployment
- on-premises
- Region
- not restricted
- Release range
- X14.0 through X15.4
- Checked
- 2026-09-25
Sources
- Cisco Expressway-E and Expressway-C Basic Configuration Deployment Guide (X14.0) - DNS Records — Cisco Systems · tier 2 current vendor documentation · DNS Records: public DNS records table, _sip._udp row note
Cite this note
APA
WarmTransfer. (2026, September 25). Expressway business-to-business calling: source note expressway-b2b-calling-sip-udp-off-default. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-sip-udp-off-default
BibTeX
@misc{warmtransfer-claim-expressway-b2b-calling-sip-udp-off-default,
title = {Expressway business-to-business calling: source note expressway-b2b-calling-sip-udp-off-default},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-sip-udp-off-default},
note = {Source note expressway-b2b-calling-sip-udp-off-default, checked 2026-09-25}
}