Hi All

Here's my question. I have a Nokia cellphone that I'd like to connect to my carputer. I want to be able to dial numbers and also to use computer's microphone and audio as a speakerphone. I know it requires two separate connections - one through the COM port for dialing and another one for audio.
Since my Nokia doesn't have a bluetooth I'm using USB data cable for dialing numbers, but I don't know how to connect audio. Does anyone tried it? The phone has only one audio input, how do you connect it to board's microphone and audio output?

Thank you for any help!