Abstract: A voiceprint identification system identifies and verifies a user from voice data collected from a single interaction with the user. The voice data is a number, word phrase or any utterance chosen by the user. A first speech-processor processes the voice data to produce first match criteria, and a second speech-processor processes the same voice data to produce second match criteria, the first match criteria being different than the second match criteria. The first match criteria is used to select a subset of authorized persons, and, for each selected authorized person, the authorized person's voice template is retrieved from a database. The retrieved voice templates are individually compared to the second match criteria until either the second match criteria matches one of the retrieved voice templates or all the retrieved voice templates have been compared without matching the second match criteria.