I am using version 38 and making calls to and from our video endpoint 
application which supports H264 (calls made over SIP, using JsSIP and through 
Kamailio). 

When I call Firefox from the endpoint, the endpoint offers this (an extract 
from the SDP):

   a=rtpmap:96 H264/90000
   a=fmtp:96 profile-level-id=42801F

I don't see an error in the callback from setRemoteDescription, but Firefox 
answers with this:

   m=video <port> RTP/SAVPF 111
   a=inactive

There is no video in either direction.

When I make a call from Firefox to our endpoint, the endpoint's answer includes 
this:

   a=fmtp:97 profile-level-id=42801F

On Firefox I then see an error in the error callback on setRemoteDescription, 
of type InvalidSessionDescriptionError:

   "Failed to negotiate codec details for all codecs"

I believe our endpoint supports packetisation mode 0 and constrained baseline 
profile (reffered to by 42801F ?) - is this acceptable to Firefox?
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