On Tuesday, March 22, 2016 at 10:56:25 AM UTC+5:30, James Criscuolo wrote:
> Hi,
>   In testing my webrtc application in firefox beta (currently 46.0b2), I've 
> found my current setup can not handle the addition of this line:
> 
> a=fmtp:116 maxplaybackrate=48000;stereo=1
> 
> I fully believe that this is an issue with my backend server (FreeSwitch), 
> and updating that would solve this, but that's not a very easy option. 
> Alternatively I can also strip the sdp of that line and then I believe the 
> sdp would match Firefox 45, but I'd prefer to pass a constraint to either 
> getUserMedia or setLocalDescription to set stereo to 0.
> 
> Does such a constraint exist? I also apologize if this has been answered 
> before, but I read through the entire bug(818618) and also searched around, 
> couldn't really find any documentation or answers on this. I saw some code in 
> the diffs (mForceMono) that seemed like it would help out, but I'm not sure 
> how to get that set using the necessary functions on RTCPeerConnection.
> 
> Thanks,
> James

Facing the same issue. And upgrading the server is difficult. Was any solution 
found. Removing and modifying steroe related attributes did not help much.
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