This presentation provides a really nice look at what may be called 'common services' - network services that are shared by providers and form the back-end support for user interfaces such as portals or learning management systems. Interesting is the diagram showing standards development in these areas - it's amazing how many common services really need to be defined. Though I notice that 'chat' and 'AV conferencing' are listed as areas where standards exist - this is news to me (beyond things like H.321). If anyone can point me to these standards, I'd appreciate it.
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