[OpenSIPS-Users] OpenSIPS as Teams SBC

[Alexey Vasilyev]

Ovidiu is right, 
MS follows RFC. Nothing special, no magic.

Yes, blog article assumes some basic understanding of how SIP proxy works,
but all the necessary steps are there. And of course, there is no single
universal solution for everybody.

You don't need to touch To, From, VIA headers and especially don't touch
Contact.
Contact header is modified only for OPTIONS request.

James, you've posted doc from MS, there is part "Contact and Record-Route
headers considerations"
https://docs.microsoft.com/en-us/microsoftteams/direct-routing-protocols-sip#contact-and-record-route-headers-considerations
They write there, use Contact modification only for OPTIONS, otherwise use
Record-Route. That's it, nothing more. And it works exactly as written.
May be your FS configured wrong? At least I don't understand, how properly
configured PBX can put two times the same URI parameter "transport=tls".
Check this please.




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Alexey Vasilyev
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