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The Viking TR-1 toll restrictor is a call limiting utility for your existing phone system. Install this device in a standard RJ11C wall mounted jack. Stop local and long-distance numbers, with a memory capable of storing up to 40 12-digit numbers for blocking. Can stop calls from going out and calls from coming in, and limit call times. Allows emergency phone calls to bypass the device, and also allows a six-digit code to be used for bypassing.