Bluetooth Audio not working

I have a Sony MEX-BT2500 Car Stereo that has Bluetooth built in. I'm able to pair my iPhone to the unit and make and receive phonecalls but not able to play music from my iPhone to the unit. I have the unit set on "Bluetooth Stereo" setting so I don't see why it won't work
Any ideas? I've tried removing the pairing, switching the iPhone off and then on but to no avail.
I was very excited with the news of A2DP but I'm a little sad now

HI Alan,
I have the same Sony Xplod Car Stereo and mine has generally been working well with the iphone 3G with OS 3.0.
When the phone pairs for phone calls you get a phone symbol appear on the stereo and when the A2DP pairs your get a second music looking symbol slightly below. I actually noticed this before I had a chance to figure out how to use it and it was simply a matter of changing the input source to BT Audio as opposed to BT Phone or previously for me for audio I was using AUX Input (via cable).
I have had a little trouble with the pairing not being as seemless as it was previously and I have had to at times manually pair the iPhone via Settings>General>Bluetooth and then pressing on the XPLOD listing for the device to tell it to pair (which should happen automatically) but this has affected both the A2DP and Phone pairing at the same time...not separately.
The biggest problem I am having is that once it is paired and playing, the play back is fine and really good quality while the screen is active. But as soon as the screen shuts off to save power the playback becomes stuttery and inconsistent. When I reactivate the screen by pressing the button or touching the screen the audio resumes normal playback. Hopefully they will fix this soon, I have notices othr people in the forums mentioning this for other devices such as headphones but thinking the headphones were the problem.
I'll be interested to see if you have the same issue once you resolve the pairing problem.
It is a shame the Microphone on the unit for phone calls is not better I have struggled wih the quality a little.
Regards
Sciecotech

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