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Re: [Linphone-developers] Opus in SDP

From: Jehan Monnier
Subject: Re: [Linphone-developers] Opus in SDP
Date: Wed, 19 Mar 2014 09:20:58 +0100


You are right, we indeed missed that point. 
It looks like OPUS does not use this channel information at all but request implementors to set it to 2.

The point is that Linphone uses this information, so we will have to proceed step by step to avoid backward compatibility issue.

Thanks anyway to pointed us  this issue. 

Le 18 mars 2014 à 21:50, Tom Hartnett <address@hidden> a écrit :

It appears Linphone offers the availability of Opus like so:
a=rtpmap:123 opus/48000

But according to the rfc is should always offer two channels like this:

a=rtpmap:123 opus/48000/2

   o  The media subtype ("opus") goes in SDP "a=rtpmap" as the encoding
      name.  The RTP clock rate in "a=rtpmap" MUST be 48000 and the
      number of channels MUST be 2.

This seems to prevent connections in some cases, e.g. with FreeSwitch.
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