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The best way to troubleshoot would be to connect your modem directly to your customer test access point/network interface. This is usually in a box on the outside of your house where the phone lines are connected. It gives you the ability to disconnect all house wire from the circuit. It's a pain in the butt, but if you have a laptop and an extension cord it shouldn't be too hard. Just unplug the telco facing jumper and connect your modem directly to it.
If you still get the same problem then I would suspect either 1. Your DSL Modem or 2. The splitter/combiner at the telco. Do you have any friendly neighbors that use the same service? You could borrow a modem to test with to eliminate the modem as a suspect.
Typically the phone line voltage is 48-52 VDC, however ringing voltage is much higher usually over 90 VDC. It is in a different frequency band than DSL, so the modem should ignore it unless it has issues.
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Lonnie
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