本标准是定义和描述补充服务的系列标准之一。这些服务5可供具有非ISDN接口的用户使用，这些用户可以访问支持SS7的网络，也可以在综合业务数字网（ISDN）的环境中使用。本标准描述了主叫姓名识别限制，这是一种原始服务，允许用户更改与用户主叫姓名相关的网络存储或订阅的隐私状态。还提供了相关的交换和信令规范。 这项服务可以按需提供，也可以通过订阅安排提供。还包括该服务与美国国家标准中定义的其他服务能力的交互。本标准的目的是实现网络和用户拥有的电信设备之间的最大兼容性，以增加SS7和基于ISDN的附加信息传输能力的吸引力和实用性。当多个网络参与提供本标准中规定的网络能力或服务时，需要相关网络之间达成双边协议。 此类协议不在本标准范围内。以前称为T1。639-1995（R2006）。

This standard is one of a series that defines and describes supplementary services. These services 5 be made available for users with non-ISDN interfaces who access SS7 capable networks and also within the context of an Integrated Services Digital Network (ISDN). This standard describes Calling Name Identification Restriction, which is an originating service that allows a user to alter the network stored or subscribed privacy status associated with the user's Calling Name. The associated switching and signaling specification are also provided. This service 5 be made available on demand or in a subscription arrangement. The interaction of this service with other service capabilities defined in American National Standards is also included.The purpose of this standard is to allow maximum compatibility among network and user owned telecommunications equipment in order to increase the attractiveness and usefulness of the additional information transfer capabilities of SS7 and ISDN-based capabilities. When more than one network is involved in the provision of network capabilities or service specified in this standard, bilateral agreements among the networks involved 5 be required. Such agreements are outside the scope of this standard. Formerly known as T1.639-1995(R2006).