There was an IMMP trial especially designed to study the capabilities of ISDN as a temporary solution for offering streaming multimedia services prior to any definitive migration to high-speed access networks.
Certainly migration to high-speed access networks will be needed as soon as it becomes critical for the evolution of the tele-education sector to provide more demanding multimedia services, based on high motion videos of good quality. But in the meanwhile, ISDN is a good access solution as far as it involves current simple multimedia tele-education systems based on audio and slow-motion video (i.e. audio and video conferencing, and educational materials containing audio and slow videos such as evolutive schemes, succession of joint images, etc). ISDN is also acceptable for medium and high motion videos in which the movement is not so important, because clear images and sound provide enough information to understand the content (i.e. guided virtual arts tours, synchronization of quick successions of joint images and audio/music).
These results have already been put into production. Additionally, the viability of certain advanced educational services has been forecast.