Source note · Enabling mixed mode and encrypted calling in Unified CM
The enterprise parameter Prepare Cluster for Rollback to pre-8.0 makes the cluster publish ITL files with empty TVS and TFTP certificate sections so phones accept a new ITL, and it should be set back once the migration is complete.
Checked 2026-09-30
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- ITL
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 15 and SUs
- Checked
- 2026-09-30
Sources
- Security Guide for Cisco Unified Communications Manager, Release 15 and SUs - Default Security — Cisco Systems · tier 2 current vendor documentation · Default Security > Bulk certificate management and phone migration
Cite this note
APA
WarmTransfer. (2026, September 30). Enabling mixed mode and encrypted calling in Unified CM: source note cucm-secure-calling-setup-rollback-pre80. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-secure-calling-setup-rollback-pre80
BibTeX
@misc{warmtransfer-claim-cucm-secure-calling-setup-rollback-pre80,
title = {Enabling mixed mode and encrypted calling in Unified CM: source note cucm-secure-calling-setup-rollback-pre80},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-secure-calling-setup-rollback-pre80},
note = {Source note cucm-secure-calling-setup-rollback-pre80, checked 2026-09-30}
}