A conference link between devices in teleconference system at one site is disclosed. The linked devices include video conference units, speakerphones or stand-alone loudspeakers. Audio data can be transmitted through the conference link between devices. Audio data processing can be performed in either...http://www.google.com.tw/patents/US8004556?utm_source=gb-gplus-share專利 US8004556 - Conference link between a speakerphone and a video conference unit
Conference link between a speakerphone and a video conference unit