In Unified CM 15, Error 26 Busy Please Try Again means the number of simultaneous login or logout requests exceeded the Maximum Concurrent Requests service parameter.
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 > Busy Please Try Again
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Extension Mobility login failures in Unified CM: source note cucm-extension-mobility-troubleshooting-err-26-busy. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-troubleshooting-err-26-busy
BibTeX
@misc{warmtransfer-claim-cucm-extension-mobility-troubleshooting-err-26-busy,
title = {Troubleshooting Extension Mobility login failures in Unified CM: source note cucm-extension-mobility-troubleshooting-err-26-busy},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-troubleshooting-err-26-busy},
note = {Source note cucm-extension-mobility-troubleshooting-err-26-busy, checked 2026-10-02}
}