Of or relating to devices that send and receive signals between devices or an other item that may aid or contribute to the use of a telephone, such as an alternative headset.
行业: 电讯
通过发送和接收声音,尤其是语音,距离的设备。电话声音声波转化为电子信号的变化。
这是一种电话通信服务系统,用户利用电信网和计算机处理系统存储、传递语音信息,形成语音留言。
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