>
>> I need to use a computer to report to the central station of an alarm
>> company.  To do this the modem must detect a 1400Hz tone followed by a
>> 2300Hz tone.  Is this something a standard modem can do?

Modems can detect their standard answer tones, but I don't think this will work for you..

A 567 or similar tone detector, tuned to the right frequency, should get you there.
I used to work on similar systems.

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