... call number 调用号 call progress signal 呼叫进展信号 call sign 呼号，标志信号 ...
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... call not accepted呼叫不接受 call progress signal呼叫进行信号 call request呼叫请求 ...
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signal call progress 呼叫行进讯号
·2,447,543篇论文数据，部分数据来源于NoteExpress
This paper provides a warning system, it use DTMF signal of telephone and MT8888 as a monolithic DTMF transceiver with call progress. It also gives the hardware and software flow chart of the system.
介绍一种基于电话网且采用MT8888作DT MF信号的收发器件的报警系统，文中给出了MT 8888与电话线的接口电路及软件流程图。
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