本国际标准规定了附加网络功能（ANF）专用用户移动性来电（PUMI） 以及专用用户移动性呼出呼叫（PUMO），适用于专用用户支持的各种基本业务 综合业务网（PISN）。ISO/IEC 11574规定了基本服务。 ANF-PUMI是一种额外的网络功能，它可以将呼入的电话定向到PISN中的PUM用户，而不考虑PUM 用户在PISN内的地理位置，前提是PUM用户的位置已知。 ANF-PUMO是一种额外的网络功能，允许PISN处理家中PUM用户的呼叫请求 位置，如果需要。 根据ETS 300 387中描述的方法，额外的网络特性规范分三个阶段产生。 本国际标准包含ANF-PUMI和ANF-PUMO的第1阶段和第2阶段规范。第一阶段 规范（第6条和第7条）规定了一般特征原则和能力。第2阶段规范（第8条和第2条） 9） 识别附加网络功能中涉及的功能实体以及它们之间的信息流。

This International Standard specifies the Additional Network Features (ANF) Private User Mobility Incoming Call (PUMI) and Private User Mobility Outgoing Call (PUMO), which are applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574. ANF-PUMI is an additional network feature that directs incoming calls to a PUM user within a PISN regardless of the PUM user's geographical location within the PISN, provided the PUM user's location is known. ANF-PUMO is an additional network feature that permits the PISN to process call requests from a PUM user at the home location, if required. Additional network feature specifications are produced in three stages, according to the method described in ETS 300 387. This International Standard contains the stage 1 and stage 2 specifications of ANF-PUMI and ANF-PUMO. The stage 1 specification (clauses 6 and 7) specifies the general feature principles and capabilities. The stage 2 specification (clauses 8 and 9) identifies the Functional Entities involved in the additional network features and the information flows between them.