Setting the Prepare Cluster for Rollback to Pre 8.0 enterprise parameter makes the cluster serve a signed ITL with blank function entries. This temporarily disables authenticated configuration, encryption and HTTPS verification on phones.
Checked 2026-10-01
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- Enterprise parameters
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 8.0 and later
- Checked
- 2026-10-01
Sources
- Understand CUCM Security By Default and ITL Operation and Troubleshooting — Cisco Systems · tier 2 current vendor documentation · Rollback / Prepare Cluster for Rollback to Pre 8.0 section
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-rollback-param-blank-itl. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-rollback-param-blank-itl
BibTeX
@misc{warmtransfer-claim-cucm-itl-trust-troubleshooting-rollback-param-blank-itl,
title = {Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-rollback-param-blank-itl},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-rollback-param-blank-itl},
note = {Source note cucm-itl-trust-troubleshooting-rollback-param-blank-itl, checked 2026-10-01}
}