Source note · Expressway business-to-business calling
For SIP/TLS between Unified CM and Expressway-C, the Expressway-C server certificate or its CA root goes into the Unified CM trust store on all servers, and the CallManager certificate or its CA root goes into Expressway-C's trusted CA list.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Cisco Expressway with Unified CM
- Subsystem
- certificates
- Deployment
- on-premises
- Region
- not restricted
- Release range
- X8.1.1+ and Unified CM 10.0+
- Checked
- 2026-09-25
Sources
- Configure Business to Business Audio/Video Calls through Expressway — Cisco Systems · tier 2 current vendor documentation · Configure: certificates
Cite this note
APA
WarmTransfer. (2026, September 25). Expressway business-to-business calling: source note expressway-b2b-calling-cucm-cert-trust. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-cucm-cert-trust
BibTeX
@misc{warmtransfer-claim-expressway-b2b-calling-cucm-cert-trust,
title = {Expressway business-to-business calling: source note expressway-b2b-calling-cucm-cert-trust},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-b2b-calling-cucm-cert-trust},
note = {Source note expressway-b2b-calling-cucm-cert-trust, checked 2026-09-25}
}