Video conferencing uses telecommunications of audio and video to bring people at different sites together for a meeting. This can be as simple as a conversation between two people in private offices (point‐to‐point) or involve several sites (multi‐point) with more than one person in large rooms at different sites. Besides the audio and visual transmission of meeting activities, video conferencing can be used to share documents, computer‐displayed information, and whiteboards.
The components within a Conferencing System can be divided up into several different layers: User Interface, Conference Control, Control or Signal Plane and Media Plane.
Video Conferencing User Interfaces could either be graphical or voice responsive. Many of us have encountered both types of interfaces; normally we encounter graphical interfaces on the computer or television, and voice responsive we normally get on the phone, where we are told to select a number of choices by either saying it or pressing a number.
User interfaces for conferencing have a number of different uses; it could be used for scheduling, setup, and making the call. Through the User Interface the administrator is able to control the other three layers of the system.
Conference Control performs resource allocation, management and routing. This layer along with the User Interface creates meetings (scheduled or unscheduled) or adds and removes participants from a conference.