The Release 15 security guide also says the ITL file is signed with the TFTP server's private key, which is the CallManager certificate key.
disputed · Checked 2026-10-01
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- ITL
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 15 and SUs
- Status
- disputed
- Checked
- 2026-10-01
Sources
- Security Guide for Cisco Unified Communications Manager, Release 15 and SUs - Default Security — Cisco Systems · tier 2 current vendor documentation · Default Security > Initial Trust List (introductory paragraph)
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-itl-signer-tftp-key. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-itl-signer-tftp-key
BibTeX
@misc{warmtransfer-claim-cucm-itl-trust-troubleshooting-itl-signer-tftp-key,
title = {Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-itl-signer-tftp-key},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-itl-signer-tftp-key},
note = {Source note cucm-itl-trust-troubleshooting-itl-signer-tftp-key, checked 2026-10-01}
}