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The Global Dialing Scheme (GDS) is numbering plan for H.323 audio-visual communication networks (often used for videoconferencing). Based on the numerology provided by the United Nations International Telecommunications Union, GDS numerology resembles the international telephone system numbering plan, with some exceptions. The Global Dialing Scheme uses a hierarchy of gatekeepers to route call set-up information nationally and internationally. National gatekeepers have knowledge of all zones within a country, World gatekeepers have knowledge of all National gatekeepers.〔http://www.wvn.ac.uk/en/support/globaldiallingschemeexplained/〕 Each basic number consists of four parts: == GDS history == In 2000, Victor Reis at HEAnet, Egon Verharen at SURFNet and Steve Williams at The Welsh Video Network began meeting by IP videoconference to discuss the requirements for an international H.323 videoconferencing dialling scheme that would allow E.164 dialling, avoiding clashes through the duplication of number spaces. Tim Poe from the University of North Carolina joined this meeting bringing USA involvement through VIDEnet and the NASM group. It was envisaged that the GDS would be in place only for a few years until SIP/e-mail address dialling was adopted by vendors - in 2012 the GDS is still in use. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Global Dialing Scheme」の詳細全文を読む スポンサード リンク
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