Make no assumptions Video conferencing was originally deployed over networks that could provide some guarantees about the level of service that would be delivered to the application. This allowed video conferencing vendors to create products to work within these parameters.
Dedicated circuits are also expensive circuits.
H.323 standards-based video conferencing was engineered for video conferences that take place on a data network, such as the Internet. These data packets are likely to arrive at their destination at varying times, and out of order. It is best to make no assumptions at all about your network's readiness for videoconferencing. You are advised to inform your network staff of your plans early on in your decision process, and ask them if your network will support videoconferencing in the locations you have in mind, including off-campus locations. The network components to be considered for videoconferencing include the wiring, terminating jacks, and network electronics.