Mobile Phone Car Kits How Do You Get Rid Of Echo On Phone Car Kit _ Blackberry Curve 8310?

How do you get rid of echo on phone car kit _ Blackberry Curve 8310? - mobile phone car kits

I connected the phone to my current Nokia CK-7W car kit and I've heard people speak very well, but they say that you hear an echo on the line. I tried to adjust the sound settings of the phone to see if the problem disappears, but does not work.