Source note · Troubleshooting Cisco IP phone registration
A phone moved from one Unified CM cluster to another can fail because the new cluster's ITL file is not signed by the signer in the ITL the phone already holds.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- ITL
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs
- Checked
- 2026-09-24
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 with Cisco Unified Communications Manager and ITL Files
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-migrate-cluster. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-migrate-cluster
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-migrate-cluster,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-migrate-cluster},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-migrate-cluster},
note = {Source note cisco-phone-registration-troubleshooting-migrate-cluster, checked 2026-09-24}
}