Installation Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs - Planning the Installation

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/install/15/cucm_b_install-guide-cucm-imp-15/cucm_m_planning-the-installation.html

Published

2026-03-17

Updated

unknown

Accessed

2026-09-30

HTTP status

200

License

Cisco website terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• A standard IM and Presence Service cluster can have at most 6 nodes. in context
• A Unified CM cluster can have at most 21 servers in total, counting the publisher, TFTP servers and media servers. in context
• In standard deployments, Unified CM and the IM and Presence Service must run supported, matching versions; a version mismatch is not supported. in context
• Unified CM and IM and Presence must either both use DNS or both not use it; mixing the two is not supported. in context
• If the Unified CM publisher cannot synchronize with an NTP server, subscriber installation can fail. in context
• The attended install order is: Unified CM publisher, then Unified CM subscribers, then the IM and Presence publisher, then IM and Presence subscribers. in context
• The Unified CM security password must be at least 8 characters, or at least 14 characters if FIPS, Common Criteria or Enhanced Security mode will be enabled. in context

Cite this source record

APA

WarmTransfer. (2026, March 17). Installation Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs - Planning the Installation. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cucm-install-guide-15-planning

BibTeX

@misc{warmtransfer-cisco-cucm-install-guide-15-planning,
  title  = {Installation Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs - Planning the Installation},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cucm-install-guide-15-planning},
  note   = {Cisco Systems, accessed 2026-09-30}
}