My friend can't here me if she calls or I call her, but input levels are good ere

Anytime my friend tries to call me from her mac or ipad, she cannot hear me talking. The same occurs when I call her, she can't hear me then either. I check my input levels for internal mike and all looks good. Also, preferences under facetime is ghosted out so I can get in to see if there is something I can do. You are suppose to be able to access preferences in facetime, right?