Thats what I did the other day is took good phone to prove if it was line or phone. 3 bad locations turned out 1 bad switch connection and 2 bad phones. I would like to have something that didn't require shutting down someone else's phone. It was much easier with a single pair.


Merritt

Business Telephones & Equipment + Commercial Audio/Video Products
Commercial Communications . . . Turner, Maine
If it was built after 1980 don't expect it to work right.