EMCC uses a PSTN Access SIP trunk so the visiting phone's outbound PSTN calls go out through gateways in the visiting cluster, and an RSVP Agent SIP trunk for RSVP-based call admission control.

Checked 2026-09-24

Vendor
Cisco
Product
Cisco Unified Communications Manager
Subsystem
emcc
Deployment
on-premises, multi-cluster
Region
not restricted
Release range
Release 15 and SUs, current as of 2026-09-24
Checked
2026-09-24

Sources

Cite this note

APA

WarmTransfer. (2026, September 24). Unified CM Extension Mobility and cross-cluster Extension Mobility: source note cucm-extension-mobility-emcc-pstn-access-trunk. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-emcc-pstn-access-trunk

BibTeX

@misc{warmtransfer-claim-cucm-extension-mobility-emcc-pstn-access-trunk,
  title  = {Unified CM Extension Mobility and cross-cluster Extension Mobility: source note cucm-extension-mobility-emcc-pstn-access-trunk},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-emcc-pstn-access-trunk},
  note   = {Source note cucm-extension-mobility-emcc-pstn-access-trunk, checked 2026-09-24}
}

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