当网络提供该功能时，本标准提供了与模拟交换接入线上的独特警报功能相关的信令要求。本标准旨在与美国电信国家标准ATIS-0600401.2000（R2005）结合使用。美国电信国家标准-网络到客户安装接口-使用环路启动和地面启动信号的模拟语音级交换接入线路。以前称为T1。401.02-2000（R2005）。

This standard provides the signaling requirements associated with Distinctive Alerting features on analog switched access lines when this capability is provided by the network. This standard is intended to be used in conjunction with American National Standard for Telecommunications - Network-to-Customer Installation Interfaces - Analog Voicegrade Switched Access Lines Using Loop-start and Ground-start Signaling, ATIS-0600401.2000(R2005). Formerly known as T1.401.02-2000(R2005).