Source note · Setting up the Webex App for Unified CM calling
Certificates using deprecated signature algorithms such as SHA-1 are not supported; Unified CM certificates must use SHA-256 or a later secure signature algorithm, and must chain to a CA known to the operating system or a self-signed certificate the administrator has deployed to the OS in advance.
Checked 2026-09-30
a supported secure signature algorithm such as SHA-256 or later
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- certificates
- Deployment
- on-premises, hybrid
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- Deployment guide for Calling in Webex App (Unified CM) - Prepare your environment for Calling in Webex App (Unified CM) — Cisco Systems · tier 2 current vendor documentation · Prepare your environment > Certificate requirements
Cite this note
APA
WarmTransfer. (2026, September 30). Setting up the Webex App for Unified CM calling: source note cucm-webex-app-calling-setup-cert-sha256. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-webex-app-calling-setup-cert-sha256
BibTeX
@misc{warmtransfer-claim-cucm-webex-app-calling-setup-cert-sha256,
title = {Setting up the Webex App for Unified CM calling: source note cucm-webex-app-calling-setup-cert-sha256},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-webex-app-calling-setup-cert-sha256},
note = {Source note cucm-webex-app-calling-setup-cert-sha256, checked 2026-09-30}
}