Since Unified CM 8.0 the CallManager.pem certificate serves as the TFTP certificate, and TFTP configuration files are signed with its private key.
Checked 2026-10-01
All TFTP configuration files are signed by the private key below
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- TFTP
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 8.0 and later
- Checked
- 2026-10-01
Sources
- Understand CUCM Security By Default and ITL Operation and Troubleshooting — Cisco Systems · tier 2 current vendor documentation · Background / ITL file section (CallManager.pem description)
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-tftp-signing-cert-cm. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-tftp-signing-cert-cm
BibTeX
@misc{warmtransfer-claim-cucm-itl-trust-troubleshooting-tftp-signing-cert-cm,
title = {Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-tftp-signing-cert-cm},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-tftp-signing-cert-cm},
note = {Source note cucm-itl-trust-troubleshooting-tftp-signing-cert-cm, checked 2026-10-01}
}