bought new 624 system with 7736 phones for home system. tech set up intial system has has been unavailable to finish. how do i set up intercom to other extensions / rooms and should i get the freeware progammator i saw recommeded by someone. is it safe? hard to use? want to set up same info on all phones (12) and make one button page all, and some phones are set up so that if someone on line, cannot pickup to have 2 on same line. Thanks.