Key Pulsing is a method of signaling by depressing keys on a line otherwise arranged for rotary pulsedialing.
按键脉冲是通过在一条线上按键而不是旋转脉冲拨号的信令方法。
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The Pulse property contains the command string used to instruct the modem to use pulse mode for dialing. Pulsedialing is necessary for phone lines that are unable to handle tone dialing. Example: P.