HTC Hero (CDMA)

I cannot get my phone to link correctly with my hands free bluetooth feature in my car. I can receive calls hands free and I can make calls hands free through my bluetooth device but I cannot make a call through my phone and have it connect with my blue tooth device. Every time I dial a # or make a call through my phone it does not connect with the blue tooth feature and I have to manually transfer the call to my bluetooth device. Has anyone else experienced this and if so were you able to correct the problem?