This document offers a brief explanation of H.323 videoconferencing.
If you need to test your H.323 videoconferencing device, place a call to 184.108.40.206. If you are able to see the Pirate and the clock your videoconferencing device is working properly.
This site has video clips of actual educational videoconferences from various providers.
Commercial site of the manufacturer of videoconferencing units.
Commercial site. Has a good link to educational uses of the unit.
Great site sponsored by MCI Worldcom. This is a portal for teachers with terrific, juried websites suitable for students. Teachers can obtain lesson plans for all grade levels and all subject areas.