The present invention establishes a direct communication session between separate users that are engaged in active sessions in an Internet chat or instant messaging environment. Within these active sessions, a video telephony call is initiated for sending video over a public data network simultaneously...http://www.google.com.hk/patents/US20030074451?utm_source=gb-gplus-share專利 US20030074451 - Integration of video telephony with chat and instant messaging environments
