Telecommunications - message waiting indicator control and notification supplementary services and associated switching and signaling specifications 电信.信息等待指示符控制和通知补充服务以及相关转换和信令规范
Ansi t1 . 622 - 92 telecommunications - message waiting indicator and notification supplementary services and associated switching and signaling specifications 电信.信息等待指示器和通知的追加服务及相关的转换和信号发送规范
Telecommunications - network to customer installation interfaces - analog voicegrade switched access lines with calling number delivery , calling name delivery , or visual message waiting indicator features 电信.网络和用户装置间的接口.带呼叫号码传送呼叫姓名传送或可视信息等待显示功能的模拟音频转换访问线路