WE ARE TESTING ABOUT 140 8410D'S THAT THE SPEAKERS BLARE IN OUR 8410 PORTS AND THE PHONES WON'T DIAL OUT. BUT IF WE CHANGE TO DIFFERENT PORTS LIKE OUR 8434 OR 8411 PORTS(ON TEST SWITCH)THE PHONES WORK FINE-BUT WE HAVE TO SWITCH PORTS FOR EACH PHONE. ANY IDEAS??