The traditional videoconferencing we have today works fine. But while many existing ISDN systems work well and need not be changed, problems of availability and cost, and the need to buy new hardware and acquire new skills, have discouraged many potential users from installing ISDN videoconferencing systems. IP, however, avoids many of those problems because it is almost ubiquitous. An ISDN connection is 100 percent dedicated to a single call, even when data or voice is not being sent. In a packet network, all packets share the same connection.
Consolidation can simplify any network.
That's three different sets of bandwidths and three different services they have to manage. T-1 Services can be used for all three applications. Calif. On one side are the cost of hardware and the monthly costs of leasing ISDN lines and Internet connection fees. The main disadvantage of using an existing IP network for videoconferencing is video's appetite for bandwidth. Calif. He says you can't start running video traffic on a network without evaluating and probably redesigning the network.