Cisco's Preferred Architecture states unauthenticated calls should be restricted from reaching protected resources such as the PSTN, including via the Calling Search Space on Unified CM.
Checked 2026-09-25
unauthenticated calls should be restricted from access to protected resources such as the PSTN
- Vendor
- Cisco
- Product
- Cisco Expressway with Cisco Unified CM
- Subsystem
- toll fraud
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Collaboration 14
- Checked
- 2026-09-25
Sources
- Preferred Architecture for Cisco Collaboration 14 Enterprise On-Premises Deployments, CVD - Collaboration Edge — Cisco · tier 2 current vendor documentation · Collaboration Edge > toll fraud prevention and call policy
Cite this note
APA
WarmTransfer. (2026, September 25). Setting up business-to-business calling on Cisco Expressway: source note expressway-b2b-setup-pa-unauth-no-pstn. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-setup-pa-unauth-no-pstn
BibTeX
@misc{warmtransfer-claim-expressway-b2b-setup-pa-unauth-no-pstn,
title = {Setting up business-to-business calling on Cisco Expressway: source note expressway-b2b-setup-pa-unauth-no-pstn},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-setup-pa-unauth-no-pstn},
note = {Source note expressway-b2b-setup-pa-unauth-no-pstn, checked 2026-09-25}
}