Videoconferencing refers to the technology wherein people can communicate, not only with voice, but also with video. Videoconferencing has largely been popular only overnetworks using a protocol like . More recently, -based networks have opened the door to newer protocols, including and .
Videoconferencing systems have traditionally been room-based systems that were relatively expensive. More recently, though, less-expensive desktop systems and even video-enabled IP-phones are gaining popularity. Use of the personal computer is not uncommon for videoconferencing applications.
Resources: IPMC Information Site