[drewski67]

Originally Posted by DLCPhoto

What is the specific adapter that is plugged into the mini-usb port of the Phone? In my setup, I use the HTC adapter, and I plug my external microphone into this. If your phone thinks the USB adapter is a headset adapter, it will be 'expecting' the external microphone (which it appears you don't have) will be in use, so it turns off the phone's internal microphone. That's my best guess, anyway (assuming you're certain that the phone's microphone isn't working).

On my TP2, when this is set-up, in the notification area, there is an icon for headset, confirming that it is not using the phone's mic, and expects the external mic to be in use. Does the TP1 have a similar notification?

What if you just attach the 3.5mm audio cable between the phone and car? That should port the sound out, and I would think that the microphone would still work (although you wouldn't have a power source that way).

Let us know.

Oops - my bad. Didn't notice I was on the TP2 forum...