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HOW TO SEND A COMMAND TO MODEM TO RECEIVE DTMF SIGNALS FROM A CALLER...?

Please Help Me...!!! I need your guys and gals help to know on how to initiate or to send a command to the Modem to accept or receive an incoming DTMF signals from a caller. And also on how to convert the incoming signals to a data input and how to convert it to a meaning full data to the programming requirements. Thank you.
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alexo
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Thank You.. Alexo I have already knew about the TAPI but the problem is I don't know how to use the TAPI's functions and it's reserved keywords on how to get a specific tone or digit inresponse to the tone. But I really don't know how to see the on-line help of my compiler.. cause I couln't find anything relating to TAPI. I really appreciate you have answered. Thank you very much.
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If you're using MSVC, put the cursor on "lineMonitorDigits" and hit F1.