Upgrade and Migration Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs - Troubleshooting

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/upgrade/15/cucm_b_upgrade-and-migration-guide_15/cucm_m_troubleshooting.html

Published

2026-08-14

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

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

Source notes citing this source

• If the upgrade fails on the Unified CM publisher, recover by restoring the publisher from a DRS backup. If that is not possible, reinstall the entire cluster. in context
• If a Unified CM subscriber fails to upgrade, restore it from a DRS backup or re-run its upgrade. The node does not have to be removed from the publisher's Server page. in context

Cite this source record

APA

WarmTransfer. (2026, August 14). Upgrade and Migration Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs - Troubleshooting. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cucm-upgrade-15-troubleshooting

BibTeX

@misc{warmtransfer-cisco-cucm-upgrade-15-troubleshooting,
  title  = {Upgrade and Migration Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs - Troubleshooting},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cucm-upgrade-15-troubleshooting},
  note   = {Cisco Systems, accessed 2026-09-25}
}