标准摘要
[中文适用范围]： 本国际标准规定了在专用综合业务网络（PISN）内连接在一起的专用综合业务网络交换机（PINX）之间的 Q 参考点处支持呼叫完成补充业务的信令协议。 呼叫完成补充服务是忙用户呼叫完成(SS-CCBS)和无应答呼叫完成(SS-CCNR)。 SS-CCBS使得主叫用户A在遇到繁忙的目的地用户B时能够在用户B变得不忙时完成呼叫，而无需进行新的呼叫尝试。 SS-CCNR 使得主叫用户 A 在遇到目标用户 B（虽然收到警报但未应答）时，能够在用户 B 经过一段活动后再次变得不忙时完成呼叫，而无需进行新的呼叫尝试。 Q 参考点在 ISO/IEC 11579-1 中定义。 服务规范按照 ETS 300 387 中指定的方法分三个阶段制定。 本国际标准包含 Q 参考点的第 3 阶段规范，并满足 ISO/IEC 13866 中第 1 阶段和第 2 阶段规范确定的要求。 SS-CCBS 和 SS-CCNR 的信令协议在基本电路交换呼叫控制的信令协议之上运行，如 ISO/IEC 11572 中所规定，并使用 ISO 中规定的补充服务控制通用过程的某些方面/IEC 11582。 该国际标准还规定了支持 SS-CC 与其他补充服务和 ANF 之间 Q 参考点交互的附加信令协议要求。 本国际标准适用于可以互连形成 PISN 的 PINX。 [外文原描述]： ISO/IEC 13870:2003 specifies the signalling protocol for the support of the Call Completion supplementary services at the Q reference point between Private Integrated services Network eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). The Call Completion supplementary services are Completion of Calls to Busy Subscribers (SS-CCBS) and Completion of Calls on No Reply (SS-CCNR). SS-CCBS enables a calling User A, encountering a busy destination User B, to have the call completed when User B becomes not busy, without having to make a new call attempt. SS-CCNR enables a calling User A, encountering a destination User B that, though alerted, does not answer, to have the call completed when User B becomes not busy again after a period of activity, without having to make a new call attempt. The Q reference point is defined in ISO/IEC 11579-1. Service specifications are produced in three stages and according to the method specified in ETS 300 387. ISO/IEC 13870:2003 contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 and stage 2 specifications in ISO/IEC 13866. The signalling protocols for SS-CCBS and SS-CCNR operate on top of the signalling protocol for basic circuit switched call control, as specified in ISO/IEC 11572, and uses certain aspects of the generic procedures for the control of supplementary services specified in ISO/IEC 11582. ISO/IEC 13870:2003 also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between SS-CC and other supplementary services and ANFs. ISO/IEC 13870:2003 is applicable to PINXs which can interconnect to form a PISN.
英文名称Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Inter-exchange signalling protocol - Call Completion supplementary services