Traversal communications are initiated from Expressway-C to Expressway-E, so no ports need opening from the DMZ to the internal network for call handling.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- firewall
- Deployment
- on-premises
- Region
- not restricted
- Release range
- X14.0 onward
- Checked
- 2026-09-25
Sources
- Cisco Expressway-E and Expressway-C Basic Configuration Deployment Guide (X14.0) - Firewall and NAT Settings — Cisco · tier 2 current vendor documentation · Firewall and NAT Settings
Cite this note
APA
WarmTransfer. (2026, September 25). Setting up business-to-business calling on Cisco Expressway: source note expressway-b2b-setup-c-initiates-traversal. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-setup-c-initiates-traversal
BibTeX
@misc{warmtransfer-claim-expressway-b2b-setup-c-initiates-traversal,
title = {Setting up business-to-business calling on Cisco Expressway: source note expressway-b2b-setup-c-initiates-traversal},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-setup-c-initiates-traversal},
note = {Source note expressway-b2b-setup-c-initiates-traversal, checked 2026-09-25}
}