Microsoft recommends, but does not require, full E.164 numbers; numbers may carry ;ext= extensions that are used to find the user when a base number matches several users, and the INVITE must then include the full number with extension.
Checked 2026-09-24
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- user enablement
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Enable users for Direct Routing — Microsoft · tier 2 current vendor documentation · Configure the phone number and enable enterprise voice, Use PowerShell
Cite this note
APA
WarmTransfer. (2026, September 24). Building a hybrid Unified CM and Teams Phone environment for a phased migration: source note cucm-teams-hybrid-build-eu-e164-extension. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-teams-hybrid-build-eu-e164-extension
BibTeX
@misc{warmtransfer-claim-cucm-teams-hybrid-build-eu-e164-extension,
title = {Building a hybrid Unified CM and Teams Phone environment for a phased migration: source note cucm-teams-hybrid-build-eu-e164-extension},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-teams-hybrid-build-eu-e164-extension},
note = {Source note cucm-teams-hybrid-build-eu-e164-extension, checked 2026-09-24}
}