Is it posible to divert calls through the dock?

[theautopilot]

I'm using THIS cable to connect my iPhone to my car stereo and charge it (with my Brodit dock with pass though dock). Works great for music, but when i receive a phone call the phone call audio comes through the iPhones ear speaker, which makes it useless as a hands free call solution.

Does anyone know if there is a way to divert the calls through the dock so i can hear them through my car speakers?

 

[saving107]

I believe it has to be Auxiliary to Auxiliary (not USB to Auxiliary) for this to work. I have the iGrip and the Aux cable and it works just fine, except the caller hears an echo of themselves from the car speakers, so adjust the volume properly.