Teams Phone Direct Routing: Definitions and RFC standards

Publisher

Microsoft

URL

https://learn.microsoft.com/en-us/microsoftteams/direct-routing-protocols

Published

2026-09-10

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Microsoft Learn terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• The Teams Phone Direct Routing media stack does not support in-band DTMF. in context
• The Direct Routing 'RFC standards' list that SBCs must comply with does not name RFC 2833 or RFC 4733, so the page does not itself specify which out-of-band DTMF method or payload type Teams expects. inferred in context
• When a PSTN leg delivers DTMF only as in-band audio, the Direct Routing SBC has to convert it to a non-in-band method before it reaches Teams, or Teams IVRs and voicemail will not see the digits. inferred in context

Cite this source record

APA

WarmTransfer. (2026, September 10). Teams Phone Direct Routing: Definitions and RFC standards. WarmTransfer. https://warmtransfer.net/knowledge/sources/ms-learn-direct-routing-protocols

BibTeX

@misc{warmtransfer-ms-learn-direct-routing-protocols,
  title  = {Teams Phone Direct Routing: Definitions and RFC standards},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/ms-learn-direct-routing-protocols},
  note   = {Microsoft, accessed 2026-09-24}
}