Source note · Cisco IP phone registration and TFTP and ITL and CTL
A bulk ITL reset with the CLI command utils itl reset is used when phones no longer trust the ITL file signer, to re-establish trust between phones and the Unified CM TFTP service.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- ITL Recovery
- 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 chapter, Perform Bulk Reset of ITL File section
Cite this note
APA
WarmTransfer. (2026, September 24). Cisco IP phone registration and TFTP and ITL and CTL: source note cisco-phone-registration-itl-reset-purpose. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-itl-reset-purpose
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-itl-reset-purpose,
title = {Cisco IP phone registration and TFTP and ITL and CTL: source note cisco-phone-registration-itl-reset-purpose},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-itl-reset-purpose},
note = {Source note cisco-phone-registration-itl-reset-purpose, checked 2026-09-24}
}