Source note · Troubleshooting Cisco IP phone registration
The phone status message 'No Trust List installed' means no CTL or ITL file is installed, and 'Trust List update failed' means an update of the CTL and ITL files failed.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- IP Phone 8800 Series
- Subsystem
- status messages
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Monitoring Phone Systems — Cisco Systems · tier 2 current vendor documentation · Monitoring Phone Systems > Status Messages table, rows No Trust List installed and Trust List update failed
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-msg-trust. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-msg-trust
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-msg-trust,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-msg-trust},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-msg-trust},
note = {Source note cisco-phone-registration-troubleshooting-msg-trust, checked 2026-09-24}
}