Extension Mobility works on phones within one Unified CM cluster; Extension Mobility Cross Cluster (EMCC) lets a user from one cluster, the home cluster, log in to a phone on another, the visiting cluster.

Checked 2026-09-30

Vendor
Cisco
Product
Unified Communications Manager
Subsystem
Extension Mobility Cross Cluster
Deployment
on-premises
Region
not restricted
Release range
Release 15 and SUs
Checked
2026-09-30

Sources

Cite this note

APA

WarmTransfer. (2026, September 30). Setting up Extension Mobility in Unified CM: source note cucm-extension-mobility-setup-emcc-definition. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-setup-emcc-definition

BibTeX

@misc{warmtransfer-claim-cucm-extension-mobility-setup-emcc-definition,
  title  = {Setting up Extension Mobility in Unified CM: source note cucm-extension-mobility-setup-emcc-definition},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-setup-emcc-definition},
  note   = {Source note cucm-extension-mobility-setup-emcc-definition, checked 2026-09-30}
}

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