A method of switching between a VoIP call and a traditional call, involving the use of a caller terminal, a call box device, a first computer device, a second computer device, and a receiver terminal. A VoIP connection has to be established before the caller terminal and the receiver terminal can engage...http://www.google.com.tw/patents/US20070223455?utm_source=gb-gplus-share專利 US20070223455 - Method of switching between VoIP call and traditional call
