Can you Disable the 3.5mm adapter when in call?

[ginkilla]

Ok, so I use the adapter that came with my pro to play music through my car stereo, I use a Jawbone2 bluetooth headset, and when I receive calls, I hear them through my stereo, and they hear me through my bluetooth. They get a really bad echo and can barely hear me when I talk though. So I have to unplug the 3.5mm cable everytime I receive/place a call. Is there a reg fix or something so that my mic and ear piece on my bluetooth will work without having to unplug the cable everytime? Thanks for your help!