本标准规定了综合业务数字网（ISDN）环境下呼叫寄存服务的服务能力。呼叫寄存是一种电路交换服务，允许用户中断现有呼叫上的语音或声带数据通信，然后从同一呼叫寄存用户组内的相同或不同终端设备重新建立通信。还提供了相关的交换、信令规范、订阅选项以及与其他美国国家标准中定义的服务的交互。以前称为T1。653-1996（R2005）。

This standard specifies the service capabilities of the Call Park service within the context of an Integrated Services Digital Network (ISDN). Call Park is a Circuit-Switched service that allows a user to interrupt a voice or voice-band data communication on an existing call, and then re-establish communications from the same or different terminal equipment within the same Call Park subscriber group. The associated switching, signaling specification, subscription options, and interactions with services defined in other American National Standard are also provided. Formerly known as T1.653-1996(R2005).