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
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