Phone Audio to USB out- how?

Question

Hey gang-
When I'm on the road, my iPhone is plugged into the USB port on my car stereo. This charges the phone and allows me to play iPod content and hear GPS commands over the car audio. Love it!
But what I can't do is hear phone audio that way. When I get a call, the Ring Tone does indeed play over the car speakers. But as soon as I answer, the caller audio plays only to the iPhone ear speaker or over the phone main Speaker- but never over the USB audio output.
Is there any way or any app that would enable this?
Thanks!
Dave

Answer 1

Dave, you are not the only one. I was able to achieve exactly what you are asking for before updating my iPhone to iOS 4. My phone is plugged into the car through a regular mini jack (not USB). I used to be able to pick up a call that would come through while I was listening to the iPod function on the phone. Both the phone ring AND the caller's voice would come through the car stereo speakers, and the microphone on the iPhone would pick up my voice, resulting in a "poor man's" hands free phone. The instant I updated to iOS 4, that capability was lost. I can pick up the call if it comes in while I listen to the iPod, and the caller will hear me but I will not hear them on the car speakers. If I tap the "speaker" button on the phone, I am then able to hear them but only on the phone's speaker.
I wish Apple would bring that capability back...