A collection of useful information and tools pertaining to DTMF.
(Yes, the ending dash is supposed to be there.)
A Blue Box design that emulates classic Blue Box tones, plus 12 other historical tone modes. It produces 12 tone signalling systems used by phone phreaks to hack other more exotic system in the US and overseas, including early pre-cellular mobile telephone systems from the 50s, 60s, and 70s, including the classic bluebox and the DTMF suite. 12 memories of up to 32 tone sequences each. Sine waves from PWM.
Maybe make myself a con badge out of it?
The Test Call is the homepage of a free (and legal!) service that offers some telephony debugging services, such as echoback (say something, it records it and plays it back), DTMF identification, a 4KHz sweep for audio quality, and caller ID checking.
4220 links, including 281 private