Car Kit - Can make calls - Can not receive

[Jeff Brokenshire]

I have a Motorola blue tooth car kit and have replaced my Razr V9 with an iPhone 4. After pairing the phone I can make calls perfectly but when an incoming call happens the iPhone 4 turns the radio off,vibrates, does not ring but when I touch the car kit, or slide/tap the phone it will not answer. The Motorola had an auto answer choice, obviously this whizz bang thing doesn't. Can anyone Help me with any advice before I start replacing the car kit which has worked perfectly with all brands of phones for 2 years.

Many Thanks

Jeff