Source note · Troubleshooting Cisco IP phone registration
Unified CM event viewer logs record EndPointUnregistered alarms carrying device name, IP address, protocol, device type and a reason code, and TAC advises focusing on the reason number, MAC address and timestamp.
Checked 2026-09-24
focus on the reason number of the error message, mac address and timestamp
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- alarms
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Troubleshoot IP Phone Unregistration Issues in CUCM — Cisco · tier 2 current vendor documentation · Troubleshoot IP Phone Unregistration Issues in CUCM > EndPointUnregistered analysis
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-epunreg-reason. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-epunreg-reason
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-epunreg-reason,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-epunreg-reason},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-epunreg-reason},
note = {Source note cisco-phone-registration-troubleshooting-epunreg-reason, checked 2026-09-24}
}