本标准规定了综合业务数字网（ISDN）环境下消息等待指示器控制和通知（MWICN）服务的服务能力。消息等待指示器控制和通知服务允许消息存储和检索（MSR）系统将MSR系统记录的消息状态通知其客户用户。还提供了相关的交换和信令规范。这项服务可通过订阅安排提供。还包括该服务与其他ANSI定义的服务功能的交互。

This standard specifies the service capabilities of Message Waiting Indicator Control and Notification (MWICN) services within the context of an Integrated Services Digital Network (ISDN). Message Waiting Indicator Control and Notification service allows a Message Storage and Retrieval (MSR) System to inform its client users about the status of messages recorded at the MSR System. The associated switching and signaling specifications are also provided. This service may be made available by subscription arrangements. The interaction of this service with other ANSI defined service capabilities are included.