I have configured OpenSIPS to act as an SBC for MS Teams.  My voip provider 
(voip.ms) supports TLS, so my outgoing calls from MS Teams work great.  On the 
incoming side though, voip.ms does not support TLS 1.2 so I’m just using TCP or 
UDP unsecured.  Of course when the call goes out to the MS Teams user, Teams 
replies with 488 Not Acceptable Here and I assume this is because it is trying 
to use RTP and not SRTP.

I see that there is an rtpengine module for OpenSIPS but I could not find a 
good example of how this could be used to encrypt the RTP packets as it passes 
to teams?

Anyone have a working example of this?  Or even better, something already 
working with Teams?

Mark
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