Telephone DTMF keypad signalling is converted to a unique user input protocol in conjunction with interactive media and telecomputing network systems to permit one or more participants to provide directional, triggering, and other input to computer or computer controlled systems with telephone keypads...http://www.google.es/patents/US5236199?utm_source=gb-gplus-sharePatente US5236199 - Interactive media system and telecomputing method using telephone keypad signalling
Interactive media system and telecomputing method using telephone keypad ...
