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IP Telephony: Packet-based Multimedia Communications Systems by Jean-Pierre Petit, David Gurle, Olivier Hersent

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Chapter 1. H.323 and a general background on IP telephony

A little history

H.323v1 had little ambition. Noting the growing success of IP, IPX and Apple Talk-based local area networks in all kinds of companies, Study Group 16 of ITU-T decided to create H.323, ‘Visual telephone systems and equipment for local area networks which provide a non-guaranteed quality of service’, a LAN-only standard for audiovisual conferences. Originally the responsibility for multimedia communications was allocated to Study Group 15. The study group had already acquired a lot of experience during the development of H.320, ‘Multimedia conferencing for ISDN-based networks’. This background had some good consequences for H.323, such as good interworking with H.320, and ...

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