I see Kiax has only obsolete OSS sound support.
Do you plan to integrate ALSA anytime soon?
Kiax uses the iaxclient library which in its turn uses PortAudio v18. as portable audio layer and it supports only OSS at the moment. The next major version of PortAudio V19 plans to support ALSA and other audio systems. When released it will be hopefully integrated in libiaxclient.
For more info on PortAudio status, here: http://www.portaudio.com/status.html
is seems that alsa is pretty ready, trivial things are not ready, but it seems usable