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网络业务交换机（PINX）之间的 Q 参考点处支持呼叫转移补充业务（SS-CT）的信令协议。 SS-CT 是一项补充服务，它使用户能够将该用户的两个呼叫（至少其中一个必须应答）转换为两个呼叫中其他两个用户之间的新呼叫。 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 13865 中第 1 阶段和第 2 阶段规范确定的要求。 SS-CT 的信令协议在用于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），并使用通用过程的某些方面来控制 ISO/IEC 11582 中规定的补充服务。 该国际标准还规定了支持呼叫转移和其他补充服务和 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 13869:2003 specifies the signalling protocol for the support of the Call Transfer supplementary service (SS-CT) at the Q reference point between Private Integrated Network services eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). SS-CT is a supplementary service which enables a User to transform two of that User's calls (at least one of which must be answered) into a new call between the two other users in the two calls. 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 13869:2003 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 13865. The signalling protocol for SS-CT operates 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 13869:2003 also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between Call Transfer and other supplementary services and ANFs. ISO/IEC 13869:2003 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 Transfer supplementary service