[VoIP] OT - Question about old touchtone phones

[Jayson Smith]

Hi,
I'm looking for an old touchtone phone. I just think it'd be cool to have
one of these. I don't even know what to look for, though, so maybe some of
you can help me. With modern phones, I don't know exactly when this started,
the duration of the touch tones are controlled by programming, such that
even on the phones that keep the tone on for as long as you hold down the
button, there's always a preset minimum duration for the tones, and pressing
two or more buttons together either doesn't do anything, or produces only
one tone, etc. But on older phones, maybe 25/30 or more years ago, the tone
was kept on for *exactly* as long as you held the button. You could hit
buttons really quickly, and there wasn't any delay between tones. If you hit
two buttons together, or more, if all of them had a common frequency, that
frequency would be sounded. You could also do other interesting things like
fade from one tone into another, etc. Afaik, most of Evan Doorbell's tapes
were recorded on such a phone, at least the ones I've heard, when there was
touchtone at all. I've noticed that even now, some cocots have that type of
keypad. Maybe they took old payphones and cocotized them? Any and all help
appreciated.
Jayson.