Source note · Expressway business-to-business calling
Cisco's example toll-fraud CPL rejects gateway-zone calls that would hairpin back out of the ISDN gateway with status 403, and can optionally reject unauthenticated callers dialling the gateway prefix 9.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- call policy
- 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) - Optional Configuration Tasks — Cisco Systems · tier 2 current vendor documentation · Task 22: example CPL
Cite this note
APA
WarmTransfer. (2026, September 25). Expressway business-to-business calling: source note expressway-b2b-calling-cpl-hairpin-403. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-cpl-hairpin-403
BibTeX
@misc{warmtransfer-claim-expressway-b2b-calling-cpl-hairpin-403,
title = {Expressway business-to-business calling: source note expressway-b2b-calling-cpl-hairpin-403},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-cpl-hairpin-403},
note = {Source note expressway-b2b-calling-cpl-hairpin-403, checked 2026-09-25}
}