Oh joy - "and the crowd went absolutely bananas". DTMF is actually the generic term for Touch-Tone (touch-tone is a. Previosly it had the tones stored in files, now it generates the tones on the fly. DTMF stands for Dual Tone Multi Frequency and it is the basis for your telephone system. While not preparing for an exam that I have tomorrow, I rewrote the generator. Using the query string it is possible to modify a number of parameters. It is possible to enter "spelled" phone numbers like 1-800-FOO-BAAR.
I think it works in most parts of the world - correct me if I'm wrong. Dual-tone multi-frequency signaling (DTMF) is an in-band telecommunication signaling system using the voice-frequency band over telephone lines between. Once the play button is pressed, the frequency sweeper will then play a tone that begins at the first frequency and sweeps to the second frequency in the duration provided. Funny the first couple of times, but otherwise almost completely useless (or did I forget something?). This frequency sweep tool allows you to enter any two frequencies and a duration into the three boxes below. My phone will then be connected to the number specified.
Using this generator I can enter a number on my computer, pick up my phone, hold the receiver towards my computer speaker, and play the generated sound file through my computer's sound card. One Sunday when I was extremely bored (perhaps I had a hangover, I don't remember) I wrote a PHP script that generates audio files containing DTMF signals for a given phone number. The signal generated when you press the touch keys on a regular phone
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