Mercedes a-Class and bluetooth sound problems

hi
both me and my wife have a iphone4 (4.3.5) and we are having bluetooth problems with her mercedes a-class 180, yes we can pair the phones but the sound quality is really bad.  Once you are busy on a phone call you have to toggle between the iphone speaker and the builtin bluetooth to get better sound.
is there anybody that have the same issue? according to my local MB dealer it is a apple issue and not an MB problem.
anny ideas?

Yep, have a 2008 A-Class and have the same problem with an iPhone 4. Sometimes crystal clear but mostly like talking to a Darlek. Signal strength, motion etc dont seem to make a difference. Have searched the net in vain,  did you find a solution?

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