iceberg

I've got a AVIC 900 unit that i like quite a bit, but one issue it's having now is interesting. i have an HTC Touch2 Windows 6.5 phone. it connects fine and the blue dot comes on. however, when a call comes in, it will ring once, then hang up on them. If i place a call, it works fine. any idea what to look at 1st? remove/resynch the phone? just found the forum so i thought i'd ask a few questions. : ) iceberg