Source note · Planning a Unified CM upgrade
The enterprise parameter Prepare Cluster for Rollback to pre-8.0 gives phones an ITL with empty TVS and TFTP sections, so they accept unsigned configuration files and any new ITL. Cisco recommends it before moving phones between clusters.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- Security by Default / ITL
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Security Guide for Cisco Unified Communications Manager, Release 15 and SUs - Default Security — Cisco Systems · tier 2 current vendor documentation · Default Security > Migrate IP Phones Between Clusters / Prepare Cluster for Rollback
Cite this note
APA
WarmTransfer. (2026, September 25). Planning a Unified CM upgrade: source note cucm-upgrade-planning-prepare-rollback-param. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-upgrade-planning-prepare-rollback-param
BibTeX
@misc{warmtransfer-claim-cucm-upgrade-planning-prepare-rollback-param,
title = {Planning a Unified CM upgrade: source note cucm-upgrade-planning-prepare-rollback-param},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-upgrade-planning-prepare-rollback-param},
note = {Source note cucm-upgrade-planning-prepare-rollback-param, checked 2026-09-25}
}