[SR-Users] Kamailio + FreeSwitch + WebRTC

[Pan Christensen]

> On Fri, Jun 15, 2018 at 08:21:56AM +0000, Pan Christensen wrote:
> > > I based my
> > > test on https://github.com/havfo/WEBRTC-to-
> > > SIP/blob/master/etc/kamailio/kamailio.cfg
> > > but I blamed my failure on an old rtpengine :)
> >
> > You need to add 'SDES-off' to the rtpengine_manage strings for calls going
> to WebRTC. Most browsers don't support fallback to SDES (anymore) and will
> reject the call if both DTLS and SDES are offered.
> 
> IIRC the problem I had was that going from RTP to SRTP, there was no key
> exchange in SDP (a=crypto) being added by rtpengine. I'll look into this again
> in the near future.

a=crypto is for SDES, and should not be present in SDP. You need a=fingerprint for DTLS.
Currently both are added by rtpengine if RTP/SAVPF is specified without SDES-off

With kind regards
Pan B. Christensen
Developer
Phonect AS