Ok, so I got a new deck deh-p7600mp, (pioneer) and it has a wire to hook up labeled "mute", I had no clue what this does, from reading the manual I understand that when you hook it up to something, and your phone rings it will mute your stereo while on the call, and when you hang up the stereo will unmute...I think this is amazing, but I cant ffind anymore information on the subject, does anyone know what is needed to hook this up? Thanks.