Recommendation 1.21 O describes the principles for defining telecommunication services supported by an ISDN, including the concept of bearer services, bearer capabilities and teleservices. It also provides the tools for the definition and description of
ITU-T I.240-1988由国际电信联盟 IX-ITU 发布于 1988。
ITU-T I.240-1988 在中国标准分类中归属于: M21 各种通信业务服务,在国际标准分类中归属于: 33.080 综合业务数字网(ISDN)。
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