Source note · Troubleshooting Teams call queues and auto attendants
When the Microsoft SIP proxy sends a REFER, the SBC must send the new INVITE back to the SIP proxy, not to the PSTN, even for transfers to an external number, copying the Refer-To and Referred-By strings unchanged.
Checked 2026-09-25
- Vendor
- Microsoft
- Product
- Microsoft Teams Phone Direct Routing
- Subsystem
- transfer
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Issues with call transfers - Microsoft Teams — Microsoft · tier 2 current vendor documentation · Call transfer methods (process steps 2-5)
Cite this note
APA
WarmTransfer. (2026, September 25). Troubleshooting Teams call queues and auto attendants: source note teams-call-queue-troubleshooting-refer-invite-to-proxy. WarmTransfer. https://warmtransfer.net/knowledge/claims/teams-call-queue-troubleshooting-refer-invite-to-proxy
BibTeX
@misc{warmtransfer-claim-teams-call-queue-troubleshooting-refer-invite-to-proxy,
title = {Troubleshooting Teams call queues and auto attendants: source note teams-call-queue-troubleshooting-refer-invite-to-proxy},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/teams-call-queue-troubleshooting-refer-invite-to-proxy},
note = {Source note teams-call-queue-troubleshooting-refer-invite-to-proxy, checked 2026-09-25}
}