12. A method of authenticating a telephone caller, the method comprising using, by the processor, the call authentication system established by the method of claim 9 to authenticate the telephone caller.
12. A method of authenticating a telephone caller, the method comprising using, by the processor, the call authentication system established by the method of claim 9 to authenticate the telephone caller. 13. The method of claim 12 , wherein the using comprises, for at least one of the plurality of telephone calls: analyzing, by the processor, the audio data to identify a plurality of words from the speech of the telephone caller and to identify an occurrence frequency for each of the plurality of words, comparing, by the processor, the plurality of words from the speech of the telephone caller and the occurrence frequency for each of the plurality of words from the speech of the telephone caller to the plurality of word clusters, based on the comparing, identifying, by the processor, a most similar word cluster of the plurality of word clusters to the audio data based on a similarity of the plurality of words from the speech of the telephone caller and the plurality of associated words of the most similar cluster and a similarity of the occurrence frequencies of the plurality of words from the speech of the telephone caller and the occurrence frequencies of the plurality of associated words of the most similar cluster, and determining, by the processor, a caller demographic of the telephone caller, the caller demographic being the same as the demographic of the most similar word cluster.