Check your microphone. You did not say what year your car is, but BMW came out with an improved mike around 2003 or 2004.

Mic aside, the BT ULF totally rocks.

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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