A system (8) for identifying an unidentified caller (14, 16, 18) includes a database (42) that contains utterance data (162) corresponding to a known caller. A data communications system (10) is coupled to the database (42) and receives utterance information corresponding to the unidentified caller (14, 16, 18). The data communications system (10) compares the utterance information with the utterance data (162) to identify the unidentified caller (14, 16, 18) as the known caller.