2006 S4 avant and Treo 700w with Verizon

BT connection works sometimes (usually best when the phone is charged). Once connected via BT you can dial and receive calls via the phone. The phone book doesnt work at all. The TREO 700 speed dial settings are recognized by the car but when you select one to dial out the system mutes the music but the phone seems to lock up and wont complete the call.