This video shows a regular old Western Electric 2500 style touchtone
telephone with a 12-button 35Y style touchtone pad, that has been converted
into a 20-button touchtone by bringing out the 1633 Hz and approximately 1880 or 1890 Hz column tones. The 1880/1890 Hz was not intentionally
designed to be a coil tap. It is the end of that coil. It works, it makes
perfectly recognizable and decodable tones. One associate of mine has
implemented a receiver in his Dialogic software that recognizes the 5th
column digits. We have named these digits going down the 5th column,
"E, F, G H". "Ahh....it's one of them 20-button jobs" -- Dom Tuffy
Негізгі бет 20 button 2500 telephone DSCN0455
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