标准摘要
[中文适用范围]： 本国际标准规定了路径替换附加网络特性（ANF-PR），适用于专用综合业务网络（PISN）支持的各种基础业务。 ISO/IEC 11574 中规定了基本服务。 ANF-PR 是一项适用于已建立呼叫的功能，允许专用综合业务网络交换机 (PINX) 之间的呼叫连接被新连接所取代。 如果新连接需要满足某些标准，ANF-PR 应与其他补充服务和/或 ANF 结合使用。 附件 A 给出了可以使用 ANF-PR 的情况以及可以管理新连接选择的标准的示例。 根据 CCITT 建议 I.130 中针对补充服务描述的方法，附加网络功能规范分三个阶段产生。 本国际标准包含 ANF-PR 第 1 阶段和第 2 阶段规范。 第一阶段规范（第 6 条）指定了发起路径替换的实体（ANF-PR 用户）所看到的功能。 第 2 阶段规范（第 7、8 和 9 条）标识了特性中涉及的功能实体以及它们之间的信息流。 第 7 条包含该功能基本操作的第 2 阶段规范。 第 8 条包含增强工作模式的第 2 阶段规范，当所有相关设备都支持时可以采用该模式。 它允许重新使用旧连接的某些元素。 第 9 条包含第二阶段规范，用于可选增强该功能的基本操作。 它允许ANF-PR用户位于旧连接中的任何PINX并决定新连接的方向。 [外文原描述]： This International Standard specifies the Path Replacement additional network feature (ANF-PR), which is applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574. ANF-PR is a feature which applies to an established call, allowing that call's connection between Private Integrated Services Network Exchanges (PINXs) to be replaced by a new connection. If the new connection is required to satisfy certain criteria, ANF-PR should be used in conjunction with other supplementary services and/or ANFs. Annex A gives examples of the circumstances under which ANF-PR can be used and criteria which can govern the selection of the new connection. Additional network feature specifications are produced in three stages, according to the method described in CCITT Recommendation I.130 for supplementary services. This International Standard contains the stage 1 and stage 2 specifications of ANF-PR. The stage 1 specification (clause 6) specifies the feature as seen by an entity which initiates path replacement, the ANF-PR user. The stage 2 specification (clauses 7, 8 and 9) identifies the functional entities involved in the feature and the information flows between them. Clause 7 contains the stage 2 specification for basic operation of the feature. Clause 8 contains the stage 2 specification for an enhanced mode of working which can be employed when supported by all the equipment involved. It allows some of the elements of the old connection to be re-used. Clause 9 contains the stage 2 specification for an optional enhancement of the basic operation of the feature. It allows the ANF-PR user to be located in any PINX in the old connection and to decide the direction of the new connection.
英文名称Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Path replacement additional network feature