信息技术.系统间通信和信息交换.联合电信网.QSIG和H.323之间信令互工作.呼叫转接补充业务

[中文适用范围]： 该国际标准规定了“QSIG”和“H.323”之间的信令互通，以支持企业电信网络（CN）内的呼叫转移补充服务。 “QSIG”是在专用综合业务网络（PISN）内的专用综合业务交换（PINX）之间的Q参考点处运行的信令协议。 Q 参考点在 ISO/IEC 11579-1 中定义。 PISN 为其用户提供电路交换基本服务和补充服务。 QSIG 在其他标准中进行了规定，特别是 ISO/IEC 11572（支持基本服务的呼叫控制）、ISO/IEC 11582（支持补充服务的通用功能协议）以及指定各个补充服务的许多标准。 ISO/IEC 13869 指定了支持协商呼叫转移的 QSIG 协议，ISO/IEC 19460 指定了支持单步呼叫转移的 QSIG 协议。 “H.323”是一组用于支持分组网络内语音或多媒体通信的信令协议，特别是使用网际协议(IP)作为其网络层协议(IP网络)的分组网络。 H.323 信令协议在 IP 网络中的端点之间运行，可以通过一个或多个网守间接运行，也可以直接运行。 端点可以是另一个网络的终端或网关。 H.323 是一个“伞”建议，指的是各种 ITU-T 建议，特别是建议 H.225.0 和 H.245（基本通信能力）以及建议 H.450.1（支持补充业务的通用功能协议）。 建议H.450.2规定了支持呼叫转移的H.323协议。 注 - H.450.2 仅适用于 1998 版 H.323（也称为 H.323 版本 2）和更高版本。 ISO/IEC 13869 支持的呼叫转接是一项补充服务，使用户（用户 A）能够将该用户的两个呼叫（至少其中一个必须应答）转换为另外两个呼叫之间的新呼叫两个呼叫中的用户（用户 B 和 C）。 ISO/IEC 19460 支持的单步呼叫转移是一种补充业务，使用户（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，而无需用户 A 进行操作。 在转接之前与用户 C 建立呼叫。 H.450.2 支持的呼叫转移是一种补充服务，使受服务用户（用户 A）能够将与第二用户（用户 B）的现有呼叫转换为用户 B 与第三用户（用户 C）之间的新呼叫)由用户A选择。 在呼叫转移之前，用户A可能已经或可能没有与用户C建立呼叫。 如果用户 A 和用户 C 之间已经建立了呼叫，则称为协商转接，相当于 ISO/IEC 13869 支持的呼叫转接。 如果用户 A 和用户 C 之间尚未建立呼叫，则称为协商转接。 称为单步呼叫转移，相当于 ISO/IEC 19460 支持的呼叫转移。 QSIG 和 H.323 之间的互通允许 PISN 用户发起的呼叫终止于 IP 网络用户，或者呼叫源自 IP 网络的用户，终止于 PISN 的用户。 该国际标准提供了以下附加功能： · 建立了两个呼叫的 PISN 用户，其中至少一个呼叫是发往或来自 IP 网络中的用户，以便能够将这两个呼叫转换为另外两个呼叫之间的新呼叫涉及的用户； · PISN 用户与 IP 网络中的用户建立呼叫或从 IP 网络中的用户建立呼叫，以便能够将该呼叫转换为 IP 网络用户与 PISN 用户选择的第三个用户之间的新呼叫，该第三个用户位于IP 网络或 PISN 中； · PISN 用户与第二个 PISN 用户建立了呼叫，以便能够将该呼叫转移到第二个用户和第一个用户选择的第三个用户之间的新呼叫，即 [外文原描述]： This International Standard specifies signalling interworking between "QSIG" and "H.323" in support of the call transfer supplementary services within a Corporate telecommunication Network (CN). "QSIG" is a signalling protocol that operates at the Q reference point between Private Integrated Services eXchanges (PINX) within a Private Integrated Services Network (PISN). The Q reference point is defined in ISO/IEC 11579-1. A PISN provides circuit-switched basic services and supplementary services to its users. QSIG is specified in other Standards, in particular ISO/IEC 11572 (call control in support of basic services), ISO/IEC 11582 (generic functional protocol for the support of supplementary services) and a number of standards specifying individual supplementary services. ISO/IEC 13869 specifies the QSIG protocol in support of call transfer by consultation and ISO/IEC 19460 specifies the QSIG protocol in support of single step call transfer. "H.323" is a set of signalling protocols for the support of voice or multimedia communication within a packet network, in particular a packet network that uses the Internet Protocol (IP) as its network layer protocol (IP network). H.323 signalling protocols operate between endpoints in an IP network, either indirectly via one or more gatekeepers, or directly. An endpoint can be a terminal or a gateway to another network. H.323 is an "umbrella" recommendation referring to various ITU-T recommendations, in particular Recommendations H.225.0 and H.245 (basic communication capabilities) and Recommendation H.450.1 (generic functional protocol for the support of supplementary services). Recommendation H.450.2 specifies the H.323 protocol in support of call transfer. NOTE - H.450.2 applies only to the 1998 version of H.323 (also known as H.323 version 2) and to later versions. Call transfer by consultation, as supported by ISO/IEC 13869, is a supplementary service that enables a user (user A) 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 (users B and C). Single step call transfer, as supported by ISO/IEC 19460, is a supplementary service that enables a user (user A) to transform an existing call between user A and user B into a new call between user B and user C without user A needing to establish a call with user C prior to transfer. Call transfer, as supported by H.450.2, is a supplementary service that enables the served user (user A) to transform an existing call with a second user (user B) into a new call between user B and a third user (user C) selected by user A. User A may or may not have a call established with user C prior to call transfer. If a call is already established between user A and user C, this is known as transfer by consultation and is equivalent to call transfer as supported by ISO/IEC 13869. If a call is not already established between user A and user C, this is known as single step call transfer and is equivalent to call transfer as supported by ISO/IEC 19460. Interworking between QSIG and H.323 permits a call originating at a user of a PISN to terminate at a user of an IP network, or a call originating at a user of an IP network to terminate at a user of a PISN. This International Standard provides the following additional capabilities: _ a PISN user with two calls established, at least one of which being to or from a user in an IP network, to be able to transform those two calls into a new call between the other two users involved; _ a PISN user with a call established to or from a user in an IP network to be able to transform that call into a new call between the IP network user and a third user selected by the PISN user, that third user being either in the IP network or in the PISN; _ a PISN user with a call established to a second PISN user to be able to transfer that call into a new call between the second user and a third user selected by the first user, that third user being in an IP network; _ an IP network user with two calls established, at least one of which being to or from a user in a PISN, to be able to transform those two calls into a new call between the other two users involved; _ an IP network user with a call established to or from a user in a PISN to be able to transform that call into a new call between the PISN user and a third user selected by the IP network user, that third user being either in the IP network or in the PISN; and ISO/IEC 21410:2001(E) 2 © ISO/IEC 2001 ? All rights reserved _ an IP network user with a call established to a second user in the IP network to be able to transfer that call into a new call between the second user and a third user selected by the first user, that third user being in a PISN. This International Standard is applicable to any interworking unit that can act as a gateway between a PISN employing QSIG and an IP network employing H.323.