The purpose of this Recommendation is to provide the stage 1 description of the method defined in Recommendation I.130 using the means given in Recommendation I.210.Supplementary services are described by a prose definition and description (step 1.1) and by a dynamic description (step 1.3).The application of the attribute technique (step 1.2),as defined in Recommendation I.140,for supplementary services is for further study.
ITU-T I.252.1-1988由国际电信联盟 IX-ITU 发布于 1988。
ITU-T I.252.1-1988 在中国标准分类中归属于: M10 通信网综合。
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