do a search for D600 in here, and check if the authentication system is the sameRecently received my Samsung U600. Successfully paired with HHF but doesn't seem fully compatible. Everytime you get in the car you have to accept the pairing on the U600. Receiving calls works but seems to go to the phone first and then transfer. Making calls sort of works to some numbers but not everytime.
I'll do some more testing and report back as there may be a few settings on the phone I can change.