Source note · One SBC serving several calling platforms

Because Teams sends REFER to an SBC that advertises it while Zoom BYOC-P never sends REFER, an SBC bridging Teams and Zoom must complete Teams-originated transfers itself or stop advertising REFER on the Teams leg. The SBC cannot simply relay REFER to Zoom.

inferred · Checked 2026-10-14

Vendor: not restricted
Product: not restricted
Subsystem: Call transfer interworking
Deployment: hybrid
Region: not restricted
Release range: current as of 2026-10-14
Status: inferred
Checked: 2026-10-14

Sources

Teams Phone System Direct Routing: SIP protocol — Microsoft · tier 2 current vendor documentation · Call transfer; combined with zoom-kb0079205 'Transfer / REFER handling'

Cite this note

APA

WarmTransfer. (2026, October 14). One SBC serving several calling platforms: source note multi-platform-sbc-design-inf-transfer-divergence. WarmTransfer. https://warmtransfer.net/knowledge/claims/multi-platform-sbc-design-inf-transfer-divergence

BibTeX

@misc{warmtransfer-claim-multi-platform-sbc-design-inf-transfer-divergence,
  title  = {One SBC serving several calling platforms: source note multi-platform-sbc-design-inf-transfer-divergence},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/multi-platform-sbc-design-inf-transfer-divergence},
  note   = {Source note multi-platform-sbc-design-inf-transfer-divergence, checked 2026-10-14}
}

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