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H.320


H.320

H.320 is an standard recommended by the ITU-T (International Telecommunication Union) for running Multimedia (Audio/Video/Data) over ISDN based networks. The main protocols present in this suite are H.221, H.230, H.242, for audio codecs i.e. G.711, and for video codecs i.e.  H.261 and H.263.
H.320 standard ISDN


H.320 is formally named as Narrow-band visual telephone systems and terminal equipment which specifies the  technical requirements typically for videoconferencing and videophone services.

Narrow-band for this specification is described as bit rates ranging from 64 kbit/s to 1920 kbit/s. This channel capacity may be provided as a single B/H0/H11/H12-channel or multiple B/H0-channels in ISDN (Integrated Services Digital Networking).

H.261 is mandatory for any enhanced H.320 system with video capability. If a visual telephone interworks with a wideband speech terminal, G.722 audio may be used instead of G.711 audio.
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