Source note · Teams Phone Direct Routing and SBC certification
SBC handling of REFER is mandatory for devices seeking Direct Routing media bypass certification, and call transfer without SBC REFER support isn't supported in media bypass mode.
Checked 2026-09-23
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- sbc-certification
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-23
- Checked
- 2026-09-23
Sources
- Teams Phone System Direct Routing: SIP protocol — Microsoft · tier 2 current vendor documentation · section 'SIP proxy send the Refer to the SBC and acts as a Transferor', first paragraph
Cite this note
APA
WarmTransfer. (2026, September 23). Teams Phone Direct Routing and SBC certification: source note teams-direct-routing-refer-required-bypass. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-direct-routing-refer-required-bypass
BibTeX
@misc{warmtransfer-claim-teams-direct-routing-refer-required-bypass,
title = {Teams Phone Direct Routing and SBC certification: source note teams-direct-routing-refer-required-bypass},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-direct-routing-refer-required-bypass},
note = {Source note teams-direct-routing-refer-required-bypass, checked 2026-09-23}
}