I have a USB modem. Is it possible to detect the phone line is busy or not?
I thought I could use AT Command to detect dial tone, but I’m not sure are there any commands support that.
Thanks.
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I have a USB modem. Is it possible to detect the phone line is busy or not?
I thought I could use AT Command to detect dial tone, but I’m not sure are there any commands support that.
Thanks.
I believe you have to do this the same as a human would… take it off hook and wait for dial tone.
Ripped from http://michaelgellis.tripod.com/modem.html