My brother called me the other day, here's the problem. He has one POTS line at his house and DSL. There are four phone jacks in the house, all homeruns to the NID. He has a dial tone at the test jack in the NID but none of the phone jacks in the house. Strangely enough his DSL continues to work in bedroom #2 phone jack but no dial tone at bedroom #2 jack or any of the others. Everything has worked fine until a few days ago and he has not done anything recently that would have disturbed any of the wiring. Any ideas?