Phone has dial tone outside but inside not making or receiving calls
I have two phone lines. Line 1 is not working, line 2 is. When I left the house around 7pm both were working just fine. Got home around 10pm and line 1 had only static when I picked it up. It is also busy if anyone tries to call it so no incoming or outgoing calls. I tried disconnecting BOTH lines outside for 5 minutes, then disconnecting both lines outside and EVERYTHING inside that was connected to a jack, including the power to the cordless phone for 5 minutes. Still the same problem. I can connect a phone to the lines in the box outside and get both dial tones and place calls. The only thing that I can think of is that the line coming in somehow just messed up? Please help. My husband does this kind of work for a living but he is out of town until Thursday night. We have an extra set of tools and I know a little bit that he has taught be like terminating a jack but I believe his line tester is with him. :( Is there another way to figure out the problem without one?