Evening all. My recently purchased 500L has steering wheel mounted telephone up and down buttons and a voice button on the other side. They appear to be inoperative and I can't make a call unless I punch the screen and scroll through the menu. The voice button doesn't bleep or operate anything else. The manual doesn't help and I've tried all on board menus. Obviously I'll take it back to the Main dealer where I bought it from, but is there a quick fix, am I doing something wrong..cheers.