Source note · Setting up an Oracle SBC for Teams Direct Routing

The Direct Routing SIP proxy sends REFER to the SBC (acting as transferor) only when the SBC lists REFER in its Allow header; this is the preferred method, it is mandatory for media bypass certification, and call transfer without SBC REFER handling is not supported in media bypass mode.

Checked 2026-09-30

Vendor: Microsoft
Product: Microsoft Teams Phone Direct Routing
Subsystem: Call transfer
Deployment: multi-tenant
Region: not restricted
Release range: current as of 2026-09-30
Checked: 2026-09-30

Sources

Teams Phone System Direct Routing: SIP protocol — Microsoft · tier 2 current vendor documentation · Call transfer; SIP proxy send the Refer to the SBC and acts as a Transferor

Cite this note

APA

WarmTransfer. (2026, September 30). Setting up an Oracle SBC for Teams Direct Routing: source note oracle-sbc-teams-direct-routing-setup-refer-bypass. WarmTransfer. https://warmtransfer.net/knowledge/claims/oracle-sbc-teams-direct-routing-setup-refer-bypass

BibTeX

@misc{warmtransfer-claim-oracle-sbc-teams-direct-routing-setup-refer-bypass,
  title  = {Setting up an Oracle SBC for Teams Direct Routing: source note oracle-sbc-teams-direct-routing-setup-refer-bypass},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/oracle-sbc-teams-direct-routing-setup-refer-bypass},
  note   = {Source note oracle-sbc-teams-direct-routing-setup-refer-bypass, checked 2026-09-30}
}

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