Probably a simple answer to my query.. I can use my hands free cell phone (iphone 4) to make & receive calls via the car Bluetooth phone & speaker system. Although my phone is paired to the VW "KUFATEC FISCON" I can hear the caller through the car speaker but the caller is unable to hear my response. if I switch the phone off KF onto speaker or phone then the caller will hear but of course not now hands-free. Before I replace what could be a faulty microphone located behind the steering wheel could I perhaps be missing something on a setting here ? Help from anyone would be appreciated.