Speaker Recognition is a different technology than “speech recognition”, which recognizes words as they are articulated, which is not a biometric. It process relies on features influenced by both the physical structure of an individual’s vocal tract and the behavioral characteristics of the individual. Speaker Recognition has a history dating back some four decades and uses the acoustic features of speech that have been found to differ between individuals. These acoustic patterns reflect both anatomy and learned behavioral patterns. Speaker verification has earned speaker recognition its classification as a “behavioral biometric”.