I have the same problem when I use my phone to dial out, I think it is because it is waiting for the bluethooth connection. If you dail from you car Navi system, it doesn't have that problem.
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I too have that same problem. I use a Motorola V505 (same as V551), and it works great in every other area. I now have to say hello, over and over again to make sure the person I call doesn't hang up.
Another problem I have; if I turn off the car and try to continue a conversation, the phone hangsup. With the previous bluetooth that I had installed in my old Lexus, it would automatically switch over the call to the handset.
Has anyone figured out a way to hold onto the call when turning off the car?