Source note · Troubleshooting Cisco IP phone registration
The phone's Restart Cause field reports values including TCP-timeout, CM-closed-TCP, KeepaliveTO, Failback, Phone-Reg-Rej, Load Rejected HC and CM-ICMP-Unreach.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- IP Phone 8800 Series
- Subsystem
- status
- 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 > Network Statistics > Restart Cause field
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-restart-cause. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-restart-cause
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-restart-cause,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-restart-cause},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-restart-cause},
note = {Source note cisco-phone-registration-troubleshooting-restart-cause, checked 2026-09-24}
}