yes, it is a small difference, but voice dialing is not allways works anyway. When I need to dial new number (very rare) - just dial on the phone. Parrot compatiple with all the bluetooth phones too.
I installed Parrot with adaptor in E90 and love the integration of the Parrot Bluetooth kits with BMW multifunction steering wheel controls. Voice dialing, answering and ending calls and adjusting volume can all be done without taking your hands off the steering wheel. No cutting or splitting any wires and sound is thru front speakers.
Works like a charm and cost must let that OEM retrofit.
Love it!!!
http://www.connects2auto.com/products/connects2auto-Parrot.pdf
picture below.