Source note · CUCM to Teams Phone migration
When BypassMode is defined, Direct Routing adds X-MS-UserLocation (internal or external), X-MS-MediaPath (the ordered SBC list for the media path, with the final SBC always last) and X-MS-UserSite (the tenant administrator's site string) to SIP INVITEs and re-INVITEs, and the Request-URI targets the SBC FQDN.
Checked 2026-09-16
X-MS-UserLocation | internal/external | Indicates if user is internal or external
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- Local Media Optimization signalling
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-16
- Checked
- 2026-09-16
Sources
- Configure Local Media Optimization for Direct Routing — Microsoft · tier 2 current vendor documentation · X-MS Headers introduced in Direct Routing on Invites and Re-Invites if BypassMode is defined (table)
Cite this note
APA
WarmTransfer. (2026, September 16). CUCM to Teams Phone migration: source note cucm-to-teams-phone-lmo-xms-headers. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-to-teams-phone-lmo-xms-headers
BibTeX
@misc{warmtransfer-claim-cucm-to-teams-phone-lmo-xms-headers,
title = {CUCM to Teams Phone migration: source note cucm-to-teams-phone-lmo-xms-headers},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-to-teams-phone-lmo-xms-headers},
note = {Source note cucm-to-teams-phone-lmo-xms-headers, checked 2026-09-16}
}