An advanced electronic telecommunication system is provided for the deposit, storage and delivery of audio messages. A Voice Message System (10) interconnects multiple private branch exchanges (12) of a subscriber with a central telephone office (22). Individual subscriber users may access the Voice...http://www.google.es/patents/US4761807?utm_source=gb-gplus-sharePatente US4761807 - Electronic audio communications system with voice authentication features
Electronic audio communications system with voice authentication features
