[VoIP] OT - Question about old touchtone phones

[Steph Kerman]

Or any ITT or S-C 2500 set for that matter, as long as it has an L-C 
rather than digital tone generator circuit. 

Certainly all L-C type dials have metallic-contact keypads which are 
easily recognized by their feel.  Most likely all digital dials have 
either snap-dome or conductive elastomer keypads, which are also very 
recognizable by their feel.

Steph

Lee Spenadel wrote:
> A plain old Western Electric 2500 desk set should do the trick.
>
> -----Original Message-----
> From: voip-bounces at ckts.info [mailto:voip-bounces at ckts.info] On Behalf Of
> Jayson Smith
> Sent: Friday, March 09, 2007 8:49 AM
> To: Voice Over IP Tandem for Analog Switches
> Subject: [VoIP] OT - Question about old touchtone phones
>
> 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.
>
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