Simulated telephone

Michael Lee mikelee at
Tue Aug 24 14:08:05 CDT 2010

PBX Simulators, different makes and models out there and while currently 
it appears the ones on ebay cost more than it would new, they can 
usually be obtained for a reasonable cost.  The models I've used have a 
handful of POTS jacks, 4 or 8 of them, and it gives basic tone and dial, 
you just dial 1 for POTS 1, etc.

On 8/24/2010 10:51 AM, Jim Scheef wrote:
> Hello all,
> I would like to play^H^H^H^H use some of my vintage portables the way 
> they were intended. For example, the Radio Shack Model 100 and the HP 
> 110 Portable have 300bps internal modems. I have several other modems 
> thru which these machines could talk to a *NIX but I do not want to 
> pay for multiple phone lines in my home. How can I simulate a POTS 
> connection between these modems? I don't need a dial tone or ringing, 
> etc., as I can just tell one machine to connect and the other to 
> answer. Way back I heard that a few modems would work if the tip and 
> ring wires of the modems were crossed and connected, but most need 
> something more than that. Is there some simple circuit I could build? 
> Surely I'm not the first to want to avoid phone bills for such 
> play^H^H^H^H testing.
> Jim

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