ISO/IEC 15772:2003规定了在专用综合业务网络（PISN）内连接在一起的专用综合业务网络交换机（PINX）之间的Q参考点处支持公共信息附加网络功能（ANF-CMN）的信令协议。 ANF-CMN是一种额外的网络功能，它可以通过PISN在代表连接两端的实体之间交换公共信息。该公共信息是与连接一端的用户或设备相关的杂项信息的集合，包括以下一项或多项:特征标识符、参与方类别、设备标识。当实体收到该信息时，该信息可用于任何目的，例如:。 g、 作为向本地用户或其他网络指示的基础，或用于过滤功能请求。 ISO/IEC 11579-1中定义了Q参考点。 按照ETS 300 387中描述的方法，分三个阶段生成附加网络功能规范。本国际标准包含Q参考点的第3阶段规范，并满足ISO/IEC 15771中第1阶段和第2阶段规范确定的要求。 ANF-CMN的信令协议在ISO/IEC 11572中规定的基本电路交换呼叫控制信令协议的基础上运行，并使用ISO/IEC 11582中规定的补充业务控制通用程序的某些方面。 ISO/IEC 15772:2003还规定了额外的信令协议要求，以支持ANF-CMN与其他补充业务和ANF之间Q参考点的交互。

ISO/IEC 15772:2003 specifies the signalling protocol for the support of the Common Information additional network feature (ANF-CMN) at the Q reference point between Private Integrated services Network eXchanges (PINX) connected together within a Private Integrated Services Network (PISN). ANF-CMN is an additional network feature which enables the exchange of Common Information between entities acting on behalf of the two ends of a connection through a PISN. This Common Information is a collection of miscellaneous information that relates to the user or equipment at one end of a connection and includes one or more of the following: Feature Identifiers, Party Category, Equipment Identity. This information, when received by an entity, can be used for any purpose, e.g. as the basis for indications to the local user or to another network or in order to filter feature requests. The Q reference point is defined in ISO/IEC 11579-1. Additional network feature specifications are produced in three stages and according to the method described in ETS 300 387. This International Standard 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 15771. The signalling protocol for ANF-CMN 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 15772:2003 also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between ANF-CMN and other supplementary services and ANFs.