Source note · Teams Phone Direct Routing and SBC certification
If the SBC advertises REFER in its Allow header, the Direct Routing SIP proxy sends REFER to the SBC and acts as Transferor (RFC 5589 section 6). Otherwise the proxy terminates the client's REFER itself and acts as Referee.
Checked 2026-09-23
- Vendor
- Microsoft
- Product
- Teams Phone Direct Routing
- Subsystem
- call-transfer
- 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 'Call transfer'
Cite this note
APA
WarmTransfer. (2026, September 23). Teams Phone Direct Routing and SBC certification: source note teams-direct-routing-refer-method-selection. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-direct-routing-refer-method-selection
BibTeX
@misc{warmtransfer-claim-teams-direct-routing-refer-method-selection,
title = {Teams Phone Direct Routing and SBC certification: source note teams-direct-routing-refer-method-selection},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-direct-routing-refer-method-selection},
note = {Source note teams-direct-routing-refer-method-selection, checked 2026-09-23}
}