In communication system (200), a packet data terminal (102) (e.g., personal computer (PC), personal digital assistant (PDA), telephone, mobile radiotelephone, network access device, Internet peripheral, and the like) initiates, coordinates, and controls the provision of on-demand conference call and...http://www.google.fr/patents/US7130280?utm_source=gb-gplus-shareBrevet US7130280 - Enhanced call service packet data terminal
