[Nosydam]

When I get in my car my cell phone automatically links with my car stereo allowing hands free talk through a mic in the stereo and audio through the car speakers. I want my pc to do the same thing at my desk at home, so I buy a bluetooth adapter for PC and I connect my phone to my pc but I can't hear any audio through my speakers and the phone automatically dials the last number called. There are also some random problems like disconnecting without cause or warning and not hanging up when I push the hang up button. What am I missing?