Source note · Troubleshooting Cisco IP phones stuck upgrading firmware
The 8800 status messages include Trust List update failed (CTL and ITL update failed) and No Trust List installed (no CTL or ITL file on the phone).
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IP Phone 8800 Series
- Subsystem
- ITL trust
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Monitoring Phone Systems — Cisco Systems · tier 2 current vendor documentation · Status Messages table, rows 'Trust List update failed' and 'No Trust List installed'
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-trust-list-fail. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-trust-list-fail
BibTeX
@misc{warmtransfer-claim-cucm-phone-firmware-upgrade-troubleshooting-trust-list-fail,
title = {Troubleshooting Cisco IP phones stuck upgrading firmware: source note cucm-phone-firmware-upgrade-troubleshooting-trust-list-fail},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-phone-firmware-upgrade-troubleshooting-trust-list-fail},
note = {Source note cucm-phone-firmware-upgrade-troubleshooting-trust-list-fail, checked 2026-10-02}
}