On Fri, May 20, 2022 at 11:30 AM Benoît Panizzon <benoit.paniz...@imp.ch> wrote:
> Hi Joshua > > > What is the specific issue that is happening? If it's that one call > > leg negotiated at opus and the other at alaw, that is currently the > > way things still work. Each call leg is still ultimately negotiated > > independently so the A leg can be opus, and the B leg can be alaw. I > > hope that we're able to eventually return to codec negotiation work > > to improve that with the foundation put into place previously, but I > > don't know when that will happen. > > It looks like I had some other misconfiguration also causing some weird > effects. > > Well wheat I wonder is how codec negotiation should work in this > situation. > > I am aware, the SDP defines what the device can send, not what it is > able to receive. But can't we assume this is the same? > > Device A <=> Asterisk <=> TSP Trunk <=> [WORLD] <=> Device B > > Let's assume Device B is alaw only, but we don't know, it could also be > possible of better quality codecs. > > Device A support opus,g711,alaw > > So towards Device A I would define !all,opus,g722,alaw > And towards the TSP Trunk the same. > > But when Device B replies with an SDP containing 'only' alaw, shouldn't > this SDP be passed to Device A which then hopefully use the same codec? > Asterisk isn't a SIP proxy, so there is no passing of SDP. Each call leg is currently independent on the answer. So between Device A and Asterisk is negotiated separately from Asterisk and Device B. Each side can end up using different codecs, and Asterisk would transcode if possible. > > Of course Device A can receive alaw and send opus. But device B might > not understand opus. > > And I just realized, this advanced codec negotiation is only available > on Asterisk 18. I'm still on 16 :-) > -- Joshua C. Colp Asterisk Technical Lead Sangoma Technologies Check us out at www.sangoma.com and www.asterisk.org
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