Require someone with good/extensive or well experienced with ALSA sound drivers or any audio sound server programs like jackaudio, portaudio, pulseaudio or anything similar.
we need to properly configure alsa on our multi-channel soundcard and also set it up with Asterisk PBX as a console driver with some modifications.
we are currently doing this but encounter a lot of issue such as sample rate issues, frame size and buffer size issues and such, so please bid only if you have really good knowledge about ALSA configuration and programming.
There is an option here to create a separate driver for the soundcard as we have some parts done too,
Mainly we are looking to try and stream audio from asterisk to the soundcard channels individually, if possible not directly from asterisk, maybe can configure it using jack and such as asterisk locks the channel one it loads the console drivers.
Can discuss in more detail but bid only if you have significant experience with audio/alsa.
can discuss the pricing as well depending on what you can do.