标准摘要
[中文适用范围]： 本标准规定了无条件呼叫前转（CFU）、遇忙呼叫前转（CFB）、无应答呼叫前转（CFNR）和呼叫偏转（CD）等补充业务，适用于专用综合业务网络（PISN）支持的各种基本业务。 ）。 ISO/IEC 11574 中规定了基本服务。 SS-CFU、SS-CFB 和 SS-CFNR 是补充服务，在呼叫建立期间应用，将传入呼叫转移到其他目的地。 SS-CD 是一项补充服务，允许服务用户通过请求将呼叫重定向到响应中指定的另一个号码来响应传入呼叫。 根据ETS 300 387中描述的方法，补充服务规范分三个阶段产生。 该国际标准包含呼叫转移补充服务的第一阶段和第二阶段规范。 第一阶段规范（第 6、7、8 和 9 条）指定了 PISN 用户所看到的补充服务。 第 2 阶段规范（第 10 条）确定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 13872:2003 specifies the supplementary services Call Forwarding Unconditional (CFU), Call Forwarding Busy (CFB), Call Forwarding No Reply (CFNR) and Call Deflection (CD), which are applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574. SS-CFU, SS-CFB and SS-CFNR are supplementary services which apply during call establishment providing a diversion of an incoming call to another destination. SS-CD is a supplementary service which allows a served user to respond to an incoming call by requesting redirection of that call to another number specified in the response. Supplementary service specifications are produced in three stages, according to the method described in ETS 300 387. ISO/IEC 13872:2003 contains the stage 1 and stage 2 specifications of the Call Diversion supplementary services. The stage 1 specifications (Clauses 6, 7, 8 and 9) specify the supplementary services as seen by users of PISNs. The stage 2 specification (Clause 10) identifies the functional entities involved in the supplementary services 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 - Call Diversion supplementary services