EMRAC uses ILS to synchronise directory numbers across clusters; if the hub ILS is down, its spokes do not synchronise until it returns.
Checked 2026-09-24
If the hub ILS is down, the spokes connected to it will not synchronize until the hub is back.
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- emrac
- Deployment
- on-premises, multi-cluster
- Region
- not restricted
- Release range
- 12.0(1)SU1 and later; Release 15 guide
- Checked
- 2026-09-24
Sources
- Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Extension Mobility Roaming Across Clusters — Cisco Systems · tier 2 current vendor documentation · Extension Mobility Roaming Across Clusters Overview; Restrictions
Cite this note
APA
WarmTransfer. (2026, September 24). Unified CM Extension Mobility and cross-cluster Extension Mobility: source note cucm-extension-mobility-emrac-ils. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-emrac-ils
BibTeX
@misc{warmtransfer-claim-cucm-extension-mobility-emrac-ils,
title = {Unified CM Extension Mobility and cross-cluster Extension Mobility: source note cucm-extension-mobility-emrac-ils},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-emrac-ils},
note = {Source note cucm-extension-mobility-emrac-ils, checked 2026-09-24}
}