BT will show up on the build sheet as something like "S644A HANDY VORB. MIT BLUETOOTH-SCHNITTS. Preparation f mobile phone w Bluetooth". I'm not sure what the feature you've mentioned is.

The ability to stream with the factory BT depends on the era and option fitted. I can't stream from the factory BT in either the e46 330 or the e63 630 but was able to stream on the f10 520d I had. The option code number on my 330 and 520d build sheets are the same. The e60 530 has the USB port in the console cubby and that works OK - can control, select, etc. from the iPod via i-Drive.

Which model of Parrott do you have? If its an MKi9100 or 9200 then it should have other cables too. IIRC the last Mki9100 that I had a few years ago had Aux-in, iPod and USB cables.