please HELP with the code that helps achieve full duplex voice communication

can anyone help me out with the code with which some mobile phone
interacts with the headset..
actually i am doing a project where in i am gonna interface
google talk..with a bluetooth cellphone..a full duplex communication..
a sniffer will run and will check for the voice chat requests..as soon
as there is a request..the call will be diverted to cellphone..using
the bluetooth channel..and a j2me application inside the cell will ask
the user to accept or reject it..

thus all helps are welcome..as far as the codes that run inside the
cellphone for full duplex voice communication..(cellphone and
headset)..
sonam kumar
sonamkumar@gmail.com