My landline is doing something odd. The DSL works just fine and the filters are installed correctly, but I have no dial tone. The phone will ring and caller ID works, but when I pick up there's nothing. When I hang up it continues to ring. This is happening on all the jacks. I have tried unplugging everything for a while and it didn't change anything. We moved into this place recently and I have no idea where the NID is. There is one in the basement that is not in use anymore, but I can't find the new one. I spoke to verizon and they say the problem is inside wiring. When I explained what was happening they said it sounded like hardware trouble. I bought another phone and the problem persists. Any thoughts, ideas, or suggestions? If we had a problem with the wiring would the DSL still work? Any suggestions are appreciated! Thanks!