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In telephony, an international gateway exchange is a telephone switch that forms the gateway between a national telephone network and one or more other international gateway exchanges, thus providing cross-border connectivity. == Requirements == Whereas international gateway exchanges are commonly implemented using hardware that could also serve to build a Class 4 (national transit) switch, some of the differences between an international gateway exchange and a Class 4 switch include: * International variants of signalling protocols, such as International ISUP and #5, in addition to the relevant national signalling protocols. * Support for echo cancellers. * Support for DCME * Support for international accounting and settlement agreements. * Support for A-law/mu-law transcoding * High capacity (some of the largest telephone exchanges in the world are international gateway exchanges). * Support for the numbering plans of each of the countries that may be dialed. * Advanced traffic routing capabilities, in order to take advantage of the best available tariffs for each destination. 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「international gateway exchange」の詳細全文を読む スポンサード リンク
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