Iphone 4 bluetooth - poor audio quality

I received complaints DAILY from friends and colleagues that my voice sounds muffled (or under water or that they simply can not understand me) when speaking to them with my bluetooth handsfree speaker kit in my car. This is very frustrating because I can hear them fine.
Reading numerous threads on forums this seems to be a SOFTWARE or HARDWARE issue. So many complaints. I have done some basic troubleshooting in that I bought TWO different BLUEANT s4 and s3 bluetooth speaker units. They work perfectly on my Blackberry - no complaints from any calls there.
It is definitely an issue with the iPhone 4.
I it incredibly hard to believe that no one Apple Employees use a bluetooth handsfree device to speak when they are in the car.
Has anyone else experienced this problem? Is there a software patch coming out? And has anyone found a solution or a handsfree unit that works correctly with the iPhone 4.

FYI - The volume on Blueant S4 works fine when pair with a Nokia mobile. The problem only happen with iphone 4S.
Similar issue can be fond on URL:
http://forums.macrumors.com/showthread.php?t=1003151
Pls note that bluetooth volume on iphone is already in max.

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Please disassociate the Edge Server from the Mediation and check the delay again.
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Poor Audio Quality From Exchange 2010 UM

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I'm experiencing an issue with our Exchange 2010 Unified Messaging system in that the audio quality is suddenly rather poor. We are using Cisco Callmanager 7 for our phone system. When you call an automated attendant, hit the "messages"
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swarup_s wrote:
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Iphone 4 bluetooth - poor audio quality

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