Iphone 4 no longer changing audio source to make call via in car bluetooth.

Hi, I have an Audi A4, my iphone 4 connects to it, you can look at the directory's, calls made, missed etc,
When you want to make a call or receive a call, the audio source from the phone is not put through the car, its only goes through the phone.
Checking the iphone, it used to show a list of audio sources i.e. the car's bluetooth connection, the speaker or the phone.
No it doesn't show the car's bluetooth.
My HTC Desire S has no such issues and voice can be heard through the car's bluetooth, so I assume that the car's bluetooth is not at fault.
Thanks for any help

I had this same problem with my iPhone 4 and my BMW. I deleted the pairing and paired the phone to the car again, and the same issue occurred.
I reset the iPhone by pressing the on/off switch and the home button and that worked! The audio sources showed up and I was able to get audio from the car.

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Hi Ross,
I understand your problem and have a fix for it. I have experienced the same problem. To fix this reset the Jawbone and iPhone and then repair them. Also make sure that if this happens again that you use the headset because the New Jawbone has an idle feature that goes in to effect after 15 minutes.
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Iphone 4 no longer changing audio source to make call via in car bluetooth.

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