Play audio and phonecalls over pc speakers via usb?

[willpower101]

I'm mainly interested in connecting my phone via usb to play phonecalls through the computer speakers so that I don't have to use those crappy earphones, listen to the terrible speakerphone, or balance this brick against my ear while I'm working.

I was able to dig up another thread with an ad2p solution, but is there not a simple way to do this via the usb cable? The pins MUST contain the audio signal since that's how the headset gets it.