What is the easiest way to get incoming CO lines to ring over paging speakers. I inherited self amplified speakers with a UPAM. I got the paging working great. Can i use the Bogen NR 100 hook 2nd analog port into it then send to MOH port on UPAM. Or should i get a 70 volt amp with proper inputs and change the page speakers to 70 volt and use in conjunction with the NR 100