Source note · Expressway business-to-business calling
The Expressway uses _h323ls._udp SRV records for H.323 location services and _h323cs._tcp SRV records for H.323 call signalling.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- DNS
- Deployment
- on-premises
- Region
- not restricted
- Release range
- X15.4
- Checked
- 2026-09-25
Sources
- Cisco Expressway Administrator Guide (X15.4) - Dial Plan and Call Processing — Cisco Systems · tier 2 current vendor documentation · Configuring H.323 SRV Records
Cite this note
APA
WarmTransfer. (2026, September 25). Expressway business-to-business calling: source note expressway-b2b-calling-h323-srv-purpose. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-h323-srv-purpose
BibTeX
@misc{warmtransfer-claim-expressway-b2b-calling-h323-srv-purpose,
title = {Expressway business-to-business calling: source note expressway-b2b-calling-h323-srv-purpose},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-h323-srv-purpose},
note = {Source note expressway-b2b-calling-h323-srv-purpose, checked 2026-09-25}
}