[OpenSIPS-Users] OpenSIPS as Teams SBC RTP->SRTP Question

[Mark Miranda]

Hi John,

Thanks for the references.  I am still struggling with this though.  The response I am getting from Teams is either SdpParsingError or BackToBackSessionTerminated and I cannot determine why.  Do you happen to have a working example?

Thanks!
Mark

> On Apr 18, 2020, at 9:26 AM, John Quick <john.quick at smartvox.co.uk> wrote:
> 
> I have written a couple of articles which, between them, should help you
> with this question.
> The first article looks at WebRTC <--> SIP using rtpengine:
> https://kb.smartvox.co.uk/opensips/webrtc-using-opensips-and-rtpengine/
> The other one discusses how you configure OpenSIPS 2.2.x for TLS:
> https://kb.smartvox.co.uk/opensips/using-tls-in-opensips-v2-2-x/
> ..in the third paragraph it mentions about SRTP-RTP transcoding with a cross
> reference to the first article and with a note about how to adjust the
> parameters sent to rtpengine so they will work for SRTP (SAVP) instead of
> WebRTC (SAVPF). So together it should provide you with the examples and
> explanations you seek.
> 
> I have been working on setting up a Teams SBC over the last 2 weeks. I have
> it working with calls in both directions and it is using rtpengine exactly
> as described in my two articles.
> Have you read the blog/knowledgebase article on the opensips web site about
> Teams SBC?
> https://blog.opensips.org/2019/09/16/opensips-as-ms-teams-sbc/
> 
> John Quick
> Smartvox Limited
> Web: www.smartvox.co.uk
> 
> 
>>> 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?
>