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They are dispatching a tech, but have cautioned me up and down that I'll be charged some expensive hourly rate if the problem isn't on their side, so I want to be sure I've done my diligence as best I can.

DSL might not have battery but for sure POTS will. Since I assume you have both on one pair then there should be battery and dialtone. Does the one connected DEMARC have a jack where you can plug in a phone to test the line? Don't worry about their BS, they are supposed to provide a working DEMARC for you to connect your inside wiring.

-Hal


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