1. A method for providing a biometrics engine that is associated with a contact center, comprising: receiving audio calls at the contact center; processing the audio calls to derive a mathematical model of a vocal tract that is associated with a predetermined caller; storing the mathematical model in a person database; receiving call attributes associated with the audio calls; comparing, in accordance with the call attributes, the mathematical model to a subsequent audio call that includes the predetermined caller; and analyzing the patterns of resonant frequencies produced as a result of the shape of the vocal tract, during both consonantal sounds and vowel sounds.