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When necessary, clean it with a damp cloth. Keep your Speakerphone Caller ID away from hot, humid conditions or strong sunlight. The Speakerphone Caller by trained engineers. NEVER attempt you could make the problem Always make sure your Speakerphone into the telephone line socket. . Check that the ringer volume switch not set to the lowest position. . Check that the total REN value of all equipment your telephone line is no more than 4. Disconnect more telephones and see whether that helps. . D