For SIP B2B call routing, _sip._tcp and _sips._tcp SRV records for the organisation's domain must be created on public DNS servers.
Checked 2026-09-25
For SIP Call Routing, SRV records must be Created on the Public DNS Servers.
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- DNS
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Expressway X8.1.1 or later
- Checked
- 2026-09-25
Sources
- Configure Business to Business Audio/Video Calls through Expressway — Cisco Systems · tier 2 current vendor documentation · Configure > DNS SRV records
Cite this note
APA
WarmTransfer. (2026, September 25). Setting up business-to-business calling on Cisco Expressway: source note expressway-b2b-setup-srv-public-sip. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-setup-srv-public-sip
BibTeX
@misc{warmtransfer-claim-expressway-b2b-setup-srv-public-sip,
title = {Setting up business-to-business calling on Cisco Expressway: source note expressway-b2b-setup-srv-public-sip},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-setup-srv-public-sip},
note = {Source note expressway-b2b-setup-srv-public-sip, checked 2026-09-25}
}