[Freeswitch-users] mod_rtmp codec

It looks like mod_rtmp has the codec hard-coded to Speex. I was wondering if there was issues with getting other codecs to work. We'd really like to use PCMA/U. I've tried changing a couple of lines of code where the codec is set and it works okay in the incoming (play) direction, but is terribly distorted or just absent in the outgoing (publish) direction. Could someone please advise whether it's possible to use other codecs, and where I'm best to get started. thanks, Paul