iPhone & dock connections in car.

[BoomAM]

Hi.
Im looking into ways to tie my iPhone into a new car headunit im thinking of getting, and ive got some questions.
At the moment, with my belkin transmitter, when a call comes in, it passes it over the transmitter connected to the dock connector, but when i press 'speaker' so i can have a conversation, it cuts that out and uses its own internal mic & speaker.

What i want to know is, if i have a 'Celsus iPod Audio RCA + Power' (effectivly a dock connector to power & RCA for cars), how will the iPhone handle incoming calls if its paired with the BT on the cars headunit?
Im kinda hoping that music will get piped through the dock connector, then when a call comes in, it all gets chucked over BT to the cars headunit.

Thoughts, advice & tips?

Thanks in advance all. .

 

[vila]

Yeah in theory that is exactly how it should hadle calls and music. However not having used that headunit its difficult to confirm - if i was you I would find a car audio shop with the unit in stock (independants are usually better) go along with your iphone and ask to have a play with it.