Source note · Expressway business-to-business calling

For inbound SIP business-to-business calls, SRV records for SIP call routing must be created on the public DNS servers so other organisations can locate the Expressway-E.

Checked 2026-09-25

Vendor: Cisco
Product: Cisco Expressway
Subsystem: DNS
Deployment: on-premises
Region: not restricted
Release range: X8.1.1 and later per the technote
Checked: 2026-09-25

Sources

Configure Business to Business Audio/Video Calls through Expressway — Cisco Systems · tier 2 current vendor documentation · Configure section: DNS SRV records for SIP call routing

Cite this note

APA

WarmTransfer. (2026, September 25). Expressway business-to-business calling: source note expressway-b2b-calling-public-srv-required. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-public-srv-required

BibTeX

@misc{warmtransfer-claim-expressway-b2b-calling-public-srv-required,
  title  = {Expressway business-to-business calling: source note expressway-b2b-calling-public-srv-required},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-public-srv-required},
  note   = {Source note expressway-b2b-calling-public-srv-required, checked 2026-09-25}
}

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