This is only a guess but is it possible that the jack or jacks are on one line and the Vonage ATA is on the other? I guessing that the ATA is also plugged into a jack, maybe try another jack. Apparently there were two lines and certain jacks may be either line. Is it possible that the jacks are wired incorrectly? This may have been asked.
Maybe tying the two lines together will produce results. No harm if both lines are dead otherwise.
Is it possible to actually trace the wires usually by following them visually in the basement?
What you need is a telephone repairman handset with prongs on the red and green wires. You can use an old telephone and place wires on the terminals until you get a dial tone.
EDIT: I found a picture:
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