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From: Don Kuenz <g@crcomp.net>
Newsgroups: sci.electronics.design
Subject: Re: How does a telephone handset work?
Date: Thu, 21 Dec 2017 23:33:58 -0000 (UTC)
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Wanderer <wanderer@dialup4less.com> wrote:
>
> I want to rig up my computer to be a tty/tdd set for the hearing impaired.
> I found this software.
>
> http://www.dxsoft.com/en/products/calltty
>
> I'm trying to avoid building the circuit.
>
> I was thinking of using of these instead.
>
> https://www.ebay.com/itm/CallTel-RJ9-Jack-to-3-5mm-Dual-Plugs-PC-Card-Y-Training-Adapter-Cord-2-MUTE-Keys/261885051425?hash=item3cf990c221:g:8LQAAOSwPhdVUZfI
>
> These things are designed to connect handsets to the sound card, but I
> want to connect the sound card to the handset connector on the phone.
> Does that work? How does the handset communicate with phone?

https://en.wikipedia.org/wiki/Modular_connector#Handset_wiring

Thank you,

--
Don Kuenz, KB7RPU