Detecting A Carrier: The modem "answer tone" first heard when you dial a computer modem is a 2100 Hz tone. This can be used to detect whether the phone number is answered by a modem carrier.
Detecting A Carrier: The modem "answer tone" first heard when you dial a computer modem is a 2100 Hz tone. This can be used to detect whether the phone number is answered by a modem carrier.
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