A simplified TV viewer response system coupled to a telephone system enables a viewer/subscriber to respond to television displays by dialing a special code less than six digits. The code is routed to an enhanced services server. The server captures the dial string including the caller ID, checks the...http://www.google.com.tw/patents/US6584613?utm_source=gb-gplus-share專利 US6584613 - Simplified TV viewer response system and method using special codes and subscriber custom calling codes
