With a PC modem (voice/fax) can I write a program that monitors the phone line for incoming calls, answers every calls after, say, 5 rings, and, most importantly, turns my phone line into something like the toll-free 1800-xxxx service? I am expecting it to play a voice message 'Welcome to..... Press 1 to.... Press 2 to....' then respond to each digit pressed by the caller accordingly. I know that this has something to do with detecting the DTMF generated when each digit is pressed. But when looking at the modem manual, especially the ATx instructions, I could not find anything useful...
I found in another forum that it is difficult to detect DTMF using a modem but still wonder if this is possible?
I found in another forum that it is difficult to detect DTMF using a modem but still wonder if this is possible?