Source note · Unified CM certificate renewal
When phones no longer trust the ITL signer, utils itl reset localkey re-signs the ITL with the ITLRecovery key. After a TFTP restart and a device reset, phones download that ITL and register correctly.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- itl
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 15 and SUs
- Checked
- 2026-09-25
Sources
- Security Guide for Cisco Unified Communications Manager, Release 15 and SUs - Default Security — Cisco Systems · tier 2 current vendor documentation · Default Security chapter, bulk reset of the ITL file
Cite this note
APA
WarmTransfer. (2026, September 25). Unified CM certificate renewal: source note cucm-certificate-renewal-itl-reset-localkey. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-certificate-renewal-itl-reset-localkey
BibTeX
@misc{warmtransfer-claim-cucm-certificate-renewal-itl-reset-localkey,
title = {Unified CM certificate renewal: source note cucm-certificate-renewal-itl-reset-localkey},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-certificate-renewal-itl-reset-localkey},
note = {Source note cucm-certificate-renewal-itl-reset-localkey, checked 2026-09-25}
}