Video conferencing is a set of interactive telecommunication technologies which allow two or more locations to interact via two-way video and audio transmissions simultaneously.
Some telephone systems now incorporate this technology into their PBX, and this is called collaboration.
Swyx is one instance of such system that supports collaboration. Not only can you do Video Conferencing via a Webcam on your laptop or desktop PC, but it also provides you with an Instant messenger and the ability to share your desktop with other Swyx Users.
Cisco UC500 also provides a video Conferencing facility, simply by adding a webcam to your desk phone (only available on certain models) or to your desktop PC / laptop.
Collaboration is a great benefit for any business that has remote workers, sales reps or anyone who works away from the office, giving them the ability to have a face to face chat without being in the office. It is also a great way on cutting down your carbon footprint as employees do not need to travel to any one location to meet.
On a larger scale you can have a Video Conference Unit that would connect to a large monitor or projector (normally used in boardrooms) where you can have multiple people all in one conference.