Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Extension Mobility Roaming Across Clusters

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_m_extension-mobility-roaming-across-clusters.html

Published

2026-09-16

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco documentation; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• With EMCC, the phone in the remote cluster registers to the user's home cluster and uses the home cluster settings; with EMRAC the phone registers only in the roaming cluster. in context
• Extension Mobility Roaming Across Clusters (EMRAC) lets users roam across multiple clusters and make or receive calls even when their home cluster is down. in context
• EMRAC uses ILS to synchronise directory numbers across clusters; if the hub ILS is down, its spokes do not synchronise until it returns. in context
• EMRAC requires at least Cisco Unified Communications Manager 12.0(1)SU1. in context
• EMRAC superusers can log in from multiple devices within the same cluster but not across clusters. in context
• Only superusers, meaning users in the Standard EM Roaming Across Clusters Super Users access control group, can perform EMRAC logins, and superuser information must be shared across all clusters. in context

Cite this source record

APA

WarmTransfer. (2026, September 16). Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Extension Mobility Roaming Across Clusters. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cucm-fcg-15-emrac

BibTeX

@misc{warmtransfer-cisco-cucm-fcg-15-emrac,
  title  = {Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Extension Mobility Roaming Across Clusters},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cucm-fcg-15-emrac},
  note   = {Cisco Systems, accessed 2026-09-24}
}