When I park any call incoming to my office (and I have 4 incoming lines), the caller cannot hear any music while they are parked. I went into my MS Response Point Administrator, and changed CONFIGURE PARK MUSIC to 'play input connected to audio jack on the base unit'. I have plugged in my Ipod through it's headphone jack to this input on the base unit, using a 3.5mm male to male plug. I've put the Ipod on shuffle music, and still nothing can be heard while parked. Can someone explain how this music on park actually works, and if it does ACTUALLY work?