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# 1000010000011101110011001111100110100101101011001011000000000
(, Tue 20 Jan 2009, 17:07, archived)
# It'd cut down on hoaxes, I'm sure.
(, Tue 20 Jan 2009, 17:08, archived)
# I have a sneaking suspision
that tone dialing means this is what goes down the line when you punch in those numbers.
I Dunno
(, Tue 20 Jan 2009, 17:13, archived)
# If memory serves
You have a 4x4 grid with the numbers on, and each row and column has a frequency. So you play a two-note chord (of a sort) for each key-press.

EDIT: Hey, I was pretty close
en.wikipedia.org/wiki/Dual-tone_multi-frequency#Keypad
(, Tue 20 Jan 2009, 17:44, archived)