HAVE ONE GROUP OF 4 PHONES AT OUR RECEPTION AREA AND ONE PHONE BY ITSELF IN ANOTHER SECTION OF THE BUILDING. (FIVE TELEPHONE #'S THAT SHOULD RING IN ROLLOVER) HAVE GROUP OF 4 IN STATION GROUP BUT WHEN MAIN LINE IS BUSY IT ROLLS OVER BUT DOES NOT RING TO OTHER PHONES, JUST FLASHES. PHONE ON OTHER SIDE OF BUILDING ONLY FLASHES. NEED IT TO RING SEPARATELY IF YOU DIAL ITS LINE DIRECTLY. ASSIGNED IT TO A DIFFERENT GROUP & TRUNK BUT THEN IT ONLY RINGS IN ROLLOVER TO THE MAIN LINE. I'M FAIRLY NEW AT THIS. CAN ANYONE HELP? WHAT AM I DOING WRONG?