如何使用AT命令检测电话线路是否繁忙 [英] How to use AT command to detect phone line is busy

问题描述

我有一个USB调制解调器.是否可以检测电话线是否繁忙?

I have a USB modem. Is it possible to detect the phone line is busy or not?

我以为我可以使用AT Command来检测拨号音，但是我不确定是否有任何命令可以支持它.

I thought I could use AT Command to detect dial tone, but I'm not sure are there any commands support that.

谢谢.

推荐答案

我相信您必须像人类一样去做...摘下电话，等待拨号音.

I believe you have to do this the same as a human would... take it off hook and wait for dial tone.

从 http://michaelgellis.tripod.com/modem.html

D单独将使调制解调器摘机并等待拨号音. (看 X命令).等待拨号音的时间长度 在拨号之前，可以在寄存器S6中对其进行编程.

D alone will take the modem off-hook and wait for a dial tone. (see X command for exceptions). The length of time to wait for a dial tone before dialing is programmable in register S6.

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