标准摘要
[中文适用范围]： 本国际标准规定了补充业务召回（SS-RE），适用于专用综合业务网络（PISN）支持的各种基础业务。 ISO/IEC 11574 中规定了基本服务。 SS-RE 是一种补充服务，如果呼叫无人应答，则该服务将被服务用户转接的呼叫重定向回被服务用户。 SS-RE 仅适用于通过加入转移后，不适用于通过重新路由转移后。 根据 ETS 300 387 中描述的方法，服务规范分三个阶段制定。 该国际标准包含 SS-RE 的第 1 阶段和第 2 阶段规范。 第一阶段规范（第 6 条）指定了 PISN 用户所看到的补充服务。 第 2 阶段规范（第 7 条）标识了补充服务中涉及的功能实体以及它们之间的信息流。 [外文原描述]： ISO/IEC 15051:2003 specifies supplementary service Recall (SS-RE), which is applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574. SS-RE is a supplementary service which provides for the redirection of a call transferred by the served user back to the served user if the call is unanswered. SS-RE is only applicable after transfer by join, not after transfer by rerouteing. Service specifications are produced in three stages, according to the method described in ETS 300 387. ISO/IEC 15051:2003 contains the stage 1 and stage 2 specifications of SS-RE. The stage 1 specification (clause 6) specifies the supplementary service as seen by users of PISNs. The stage 2 specification (clause 7) identifies the functional entities involved in the supplementary service and the information flows between them.
英文名称Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Recall supplementary service