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You probably have a short circuit in your wiring somewhere in your line. You can still hear because phones do not require a such and absolutely-constant flow of electricity like other electrical appliances do; they can transmit static. It could also be due to something finally giving up the battle against time, such as a slipped connection or, as suggested above, a poorly insulated wire. Even a bump against a wall could have slipped the connection. If you cannot find the short, a phone technician will have testing tools that can help pinpoint the problem far quicker than you could do on your own.