In Unified CM 15, Error 25 User Logged in Elsewhere appears when the user is already logged in on another phone and the Multiple Login Behavior service parameter does not allow multiple logins.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- Extension Mobility
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 15 and SUs
- Checked
- 2026-10-02
Sources
- Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Extension Mobility — Cisco Systems · tier 2 current vendor documentation · Troubleshooting Extension Mobility > User Logged in Elsewhere; Service Parameters table > Multiple Login Behavior
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Extension Mobility login failures in Unified CM: source note cucm-extension-mobility-troubleshooting-err-25-elsewhere. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-troubleshooting-err-25-elsewhere
BibTeX
@misc{warmtransfer-claim-cucm-extension-mobility-troubleshooting-err-25-elsewhere,
title = {Troubleshooting Extension Mobility login failures in Unified CM: source note cucm-extension-mobility-troubleshooting-err-25-elsewhere},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-troubleshooting-err-25-elsewhere},
note = {Source note cucm-extension-mobility-troubleshooting-err-25-elsewhere, checked 2026-10-02}
}