Interfacing bluetooth enabled mobile phone with voice chat messengers

I am trying to develop an application that will interface a voice chat
messenger with bluetooth enabled mobile phone so that the person using
the mobile phone can receive their voice chat request in their mobile
phone . Which is relayed to the phone from the computer terminal
running the IM client using bluetooth.
My doubt is that how audio communications taking over bluetooth and
how it can be relayed to the IM client.
Any idea, links to informations, and codes relating to it are
welcome.

Thanks in advance...

Saura