1. A prison phone monitoring system comprising: an audio database containing digitized audio signals storing a plurality of voice models and a plurality of recorded telephone calls; a call monitoring system for interfacing with a call network for monitoring a first telephone call, wherein the call monitoring system is configured to: detect a 3-way call event, wherein the 3-way call event indicates a new voice joining the monitored first telephone call; search the audio database for a voice model matching the new voice; determine a phone number for an individual associated with the matching voice model; and utilizing a call network query to determine a busy status of the phone number during the first telephone call.