Sure, I haven't installed the mic in my car yet, but sitting at my desk it works fine. Install the WIDCOMM drivers like the thread says. Make sure you install support for the voice gateway.
With the SE T637 PhoCo connects the PC to the phone and I hear out of the speakers and talk into the mic. There's a slight delay, but that's to be expected.
Maybe it's something with you phone. From what I understand the SE's work the best with Bluetooth and PhoCo.
This prob didn't help you, but you asked