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Pradeep_Patil's avatar
Pradeep_Patil
Copper Contributor
Mar 18, 2022

Redirecting SIP calls from another SIP server to Teams user

I am trying to understand if SIP calls can be transferred/redirected from a another/thirdparty SIP server to a Microsoft Teams user.   I was reading below links: https://docs.microsoft.com/en-us/m...
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StevieG1966's avatar
StevieG1966
Copper Contributor
Aug 29, 2023
I have the same question. I need to interconnect a 3rd party cloud PBX to Teams. Does Teams support incoming SIP calls from external SIP servers?
  • StevieG1966's avatar
    StevieG1966
    Copper Contributor
    Aug 29, 2023

    StevieG1966 

     

    looking at this article, Microsoft Teams call flows - Microsoft Teams | Microsoft Learn 

     

    I see this, which makes me think that direct SIP calls into Teams are not supported.  I am I reading this correctly?

    Interoperability restrictions

    Third-party media relays. A Teams media flow (that is, where one of the media endpoints is Teams) may traverse only Teams or Skype for Business native media relays. Interoperability with a third-party media relay is not supported. (Note that a third-party SBC on the boundary with PSTN must terminate RTP/RTCP stream, secured using SRTP, and not relay it to the next hop.)

    Third-party SIP proxy servers. A Teams signaling SIP dialog with a third-party SBC and/or gateway may traverse Teams or Skype for Business native SIP proxies. Interoperability with a third-party SIP proxy is not supported.

    Third-party B2BUA (or SBC). A Teams media flow to and from the PSTN is terminated by a third-party SBC. However, interoperability with a third-party SBC within the Teams network (where a third-party SBC mediates two Teams or Skype for Business endpoints) is not supported.

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