Security Guide for Cisco Unified Communications Manager, Release 15 and SUs - TLS 1.3 Setup (From Release 15SU2 Onwards)

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/security/15_0/cucm_b_security-guide-release-15/cucm_m_tls-setup_2.html

Published

2026-09-22

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco copyright; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• On a fresh install the minimum TLS version is 1.2, with TLS 1.0 and 1.1 disabled. An upgrade or migration keeps the minimum TLS version from the previous release. in context
• A minimum TLS version change made on the publisher replicates to the other cluster nodes. IM and Presence must be configured separately, and all nodes must be restarted for the change to take effect. in context
• The minimum TLS version is set with set tls min-version (for example, set tls min-version 1.3) and checked with show tls min-version. in context
• Unified CM supports TLS 1.3 from Release 15SU2 onwards. in context

Cite this source record

APA

WarmTransfer. (2026, September 22). Security Guide for Cisco Unified Communications Manager, Release 15 and SUs - TLS 1.3 Setup (From Release 15SU2 Onwards). WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cucm-sec15-tls13-setup

BibTeX

@misc{warmtransfer-cisco-cucm-sec15-tls13-setup,
  title  = {Security Guide for Cisco Unified Communications Manager, Release 15 and SUs - TLS 1.3 Setup (From Release 15SU2 Onwards)},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cucm-sec15-tls13-setup},
  note   = {Cisco Systems, accessed 2026-09-25}
}