Source note · Troubleshooting Cisco IP phone registration
Deleting trust files from phones is a last resort: the bulk ITL reset from Unified CM should be tried before touching phones individually, because a manual deletion must be done at each phone.
inferred · Checked 2026-09-24
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- ITL
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs
- Status
- inferred
- 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 > Perform Bulk Reset of ITL File (read with 116232 ITL deletion section)
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-itl-first. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-itl-first
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-itl-first,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-itl-first},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-itl-first},
note = {Source note cisco-phone-registration-troubleshooting-itl-first, checked 2026-09-24}
}