What is the year and model of your car?

Many cars in the 2000 - 2002 model years had additional wiring for a separate voice recognition module (the "SES module"). That was in-line between the telephone module and the microphone. If your car has the SES wiring, then you need to get the SES jumper to make your microphone work.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input