It was several items but they are now documented at:
https://freeswitch.org/confluence/display/FREESWITCH/Codec+Negotiation#CodecNegotiation-MixingMedia/Codecsondifferentlegs(transcoding)

~mitch

On Thu, Dec 3, 2015 at 12:31 PM, Russell Treleaven <rtreleaven@bunnykick.ca> wrote:
Please share the solution.

On Thu, Dec 3, 2015 at 3:18 PM, Mitch Capper <mitch.capper@gmail.com> wrote:
This was solved in irc thanks:)

~mitch

On Thu, Dec 3, 2015 at 6:34 AM, Mitch Capper <mitch.capper@gmail.com> wrote:
I am not sure if I just don't understand the negotiation process correctly or something is wrong.  Currently running 5ab62d81147 (2015-11-26).   I am getting INCOMPATIBLE_DESTINATION which seems to be because FS is only offering the b leg the codec it settles on for the A leg (sounds very much as if inherit_codec is true or disable-transcoding is true however both are set to false).

Making a simple outbound bridge through mod_sofia and the A leg only supports a codec B does not (SPEEX for example) and it ends up that is the only thing offered to the B leg. 

I do have inbound-codec-negotiation set to generous and inbound-late-negotiation set to true (for both profiles), but I would assume FS should still offer all the outbound-codec-prefs on the invite for the bridge, but instead it is only offering the a-leg codec.

I would assume it should just transcode but instead it fails.

fail: https://pastebin.freeswitch.org/24471 works: https://pastebin.freeswitch.org/24472

I am not sure what I am missing.

~mitch



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