Bold Bluetooth settings question

I set up bluetooth so that it connects with my mazda, but I was wondering if anyone would know how I could disable the calls being routed to the mazda speakers/mic and only enable the audio (as in music to be played via bluetooth on the mazda speakers). Basically I want to be able to listen to the music in the car, but I don't want everyone else in the car to be able to hear my calls. Is there a setting on the phone where I can disable this.

In bluetooth options, under services I found "Headset" and "Handsfree," would I disable those? Or the "allow outgoing calls"?

I'm not sure what all these do.

Thanks