信息技术.系统间远程通信和信息交换.专用综合业务网.交换间信令协议.单步呼叫转移补充业务

[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中心（PINX）之间的 Q 参考点处支持单步呼叫转移补充业务（SS-SSCT）的信令协议。 SS-SSCT是一种补充业务，它使得用户A能够将用户A和用户B之间的现有呼叫转换为用户B和用户C之间的新呼叫，其中用户A之前没有与用户C建立过呼叫呼叫转接。 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 19459 中第 1 阶段和第 2 阶段规范确定的要求。 SS-SSCT 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单步呼叫转移与其他补充服务和 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 19460:2003 specifies the signalling protocol for the support of the Single Step Call Transfer supplementary service (SS-SSCT) at the Q reference point between Private Integrated Network services eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN). SS-SSCT is a supplementary service which enables a user, user A, to transform an existing call between user A and user B into a new call between user B and a user C whereby user A does not have a call established with user C prior to call transfer. 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 19460:2003 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 19459. The signalling protocol for SS-SSCT 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 19460:2003 also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between Single Step Call Transfer and other supplementary services and ANFs. ISO/IEC 19460:2003 is applicable to PINXs which can interconnect to form a PISN.