On a Teams REFER the SBC must send the new INVITE back to the Microsoft SIP proxy, with the Request-URI set to the Refer-To string and the Referred-By header copied unchanged, even when the target is an external PSTN number.

Checked 2026-09-25

Vendor
Microsoft
Product
Microsoft Teams Phone Direct Routing
Subsystem
call transfer
Deployment
multi-tenant
Region
not restricted
Release range
current as of 2026-09-25
Checked
2026-09-25

Sources

Cite this note

APA

WarmTransfer. (2026, September 25). Microsoft Teams with Amazon Connect: source note teams-with-amazon-connect-xi-invite-back-to-proxy. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-with-amazon-connect-xi-invite-back-to-proxy

BibTeX

@misc{warmtransfer-claim-teams-with-amazon-connect-xi-invite-back-to-proxy,
  title  = {Microsoft Teams with Amazon Connect: source note teams-with-amazon-connect-xi-invite-back-to-proxy},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/teams-with-amazon-connect-xi-invite-back-to-proxy},
  note   = {Source note teams-with-amazon-connect-xi-invite-back-to-proxy, checked 2026-09-25}
}

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