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h 320 wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 see also 2 references 3 external links toggle the table of contents h 320 5 languages español français italiano 日本語 русский edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia h 320 narrow band visual telephone systems and terminal equipment status published year started 1990 latest version 03 04 march 2004 organization itu t related standards h 221 h 230 h 242 h 261 h 262 h 263 h 264 h 265 website https www itu int rec t rec h 320 h 320 or narrow band visual telephone systems and terminal equipment is an umbrella recommendation by the itu t for running multimedia audio video data over isdn based networks the main protocols in this suite are h 221 h 230 h 242 audio codecs such as g 711 pcm and g 728 celp and discrete cosine transform dct video codecs such as h 261 and h 263 1 it is formally named as narrow band visual telephone systems and terminal equipment it specifies technical requirements for narrow band visual telephone systems and terminal equipment typically for videoconferencing and videophone services it describes a generic system configuration consisting of a number of elements which are specified by respective itu t recommendations definition of communication modes and terminal types call control arrangements terminal aspects and interworking requirements 2 the service requirements for visual telephone services are presented in itu t recs f 720 for videotelephony and f 702 for videoconference video and audio coding systems and other technical aspects common to audiovisual services are covered in other recommendations in the h 200 f 700 series narrow band for this specification is defined 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 used video codecs h 261 and optionally h 262 h 263 h 264 according to the video hierarchy specified in specification and in itu t recs h 241 and h 242 h 261 is mandatory in any enhanced h 320 system with video capability baseline h 263 capability shall be required in systems that use enhanced video modes 2 used audio codecs g 711 and optionally g 722 g 728 g 723 1 g 729 example of usage if a visual telephone interworks with a wideband speech terminal g 722 audio may be used instead of g 711 audio 2 see also edit h 323 h 324 h 331 references edit davis andrew 13 june 1997 the h 320 recommendation overview ee times retrieved 7 november 2019 1 2 3 itu t 2004 03 pdf h 320 narrow band visual telephone systems and terminal equipment retrieved on 2009 07 21 external links edit itu t website itu t h 320 narrow band visual telephone systems and terminal equipment technical specification this article related to telecommunications infrastructure is a stub you can help wikipedia by adding missing information v t e retrieved from https en wikipedia org w index php title h 320 oldid 1317396951 categories integrated services digital network videotelephony itu t recommendations itu t h series recommendations telecommunication infrastructure stubs hidden category all stub articles this page was last edited on 17 october 2025 at 22 14 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents h 320 5 languages add topic