Source note · Expressway business-to-business calling
Cisco's example public DNS for H.323 publishes _h323cs._tcp on port 1720 for call signalling, plus _h323ls._udp and _h323rs._udp on port 1719, all targeting the Expressway-E.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- DNS
- Deployment
- on-premises
- Region
- not restricted
- Release range
- X14.0 guide
- 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 (Expressway-E)
Cite this note
APA
WarmTransfer. (2026, September 25). Expressway business-to-business calling: source note expressway-b2b-calling-public-h323-srv-set. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-public-h323-srv-set
BibTeX
@misc{warmtransfer-claim-expressway-b2b-calling-public-h323-srv-set,
title = {Expressway business-to-business calling: source note expressway-b2b-calling-public-h323-srv-set},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-public-h323-srv-set},
note = {Source note expressway-b2b-calling-public-h323-srv-set, checked 2026-09-25}
}