An inmate messaging system and method for notifying an inmate in a prison facility of messages received from a caller outside the prison facility. The caller dials into the inmate messaging system using, for example, a conventional "touch tone" telephone. The caller is prompted by the system for identifying...http://www.google.de/patents/US6665380?utm_source=gb-gplus-sharePatent US6665380 - Inmate messaging system and method
