Have a Panasonic DBS 44 Series Key Telephone, VB-44223-22 Key Small Display Speakerphone. I had to move an ext. from one port to another due to lightning, his phone did ring on one line and now it doesn't, the phone has six lines. How do I program his phone to ring on his line only? How can I put his name on the set, right now it says ext 113.