Check the phone settings, some phones have setting that will disable bluetooth cals from external source. This is becouse there have been some reports about bluetooth hacks that will let someone use your phone withouth you knowing about it.
Well you eventualy find out (when the bill comes)

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005