[MovedGoalPosts]

Everything on the street side of your NTE5 Master socket, including the master socket itself, is the responsibility of the Telco. If you have extensions unplug them so only the master socket remains. From there, if you have more problems with a noisy line fault it has to be the telco's line problem. Stop talking to them that you have a concern about your internal wiring condition. Just keep reporting it as a fault on the service to your property.