I like to implement Video Conferencing facility in our College, what are the equipments&facilities required?

There are video conferencing equipment from Tandberg, Polycomm, Aethra, Godrej etc., are avilable and also lot of companies providing video conferencing solution. To implement video conferencing, what are the prerequisites required especially equipments and ISDN Connection. What are the information we have to check before buying the equipments and what are the features which we have to study in the components?

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