Hi... We currently have a two room hookup and are considering adding a third room which would have just a simple D10 box. I have a satellite connection pulled to that room but not a phone line. What is the real purpose of having a phone line plugged in to each receiver?? What role does it play with any of the receivers, especially a D10?? Would I still be able to hook up a D10 in that room without a phone line or must I go to the trouble of getting one in there?? Any help would be appreciated... thanks much... bob...