[Linphone-developers] Opus in SDP

[Tom Hartnett]

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.