Source note · Expressway business-to-business calling
A traversal client keeps a connection open through the firewall to a designated port on the traversal server using keepalives, and the server sends incoming call requests to the client over that connection.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- firewall traversal
- Deployment
- on-premises
- Region
- not restricted
- Release range
- X15.4
- Checked
- 2026-09-25
Sources
- Cisco Expressway Administrator Guide (X15.4) - Firewall Traversal — Cisco Systems · tier 2 current vendor documentation · How firewall traversal works
Cite this note
APA
WarmTransfer. (2026, September 25). Expressway business-to-business calling: source note expressway-b2b-calling-traversal-mechanism. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-traversal-mechanism
BibTeX
@misc{warmtransfer-claim-expressway-b2b-calling-traversal-mechanism,
title = {Expressway business-to-business calling: source note expressway-b2b-calling-traversal-mechanism},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-traversal-mechanism},
note = {Source note expressway-b2b-calling-traversal-mechanism, checked 2026-09-25}
}