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<font face="Arial">Shouldn't be that hard to do, I designed some
POTS phone line interfaces WAY back in the 80s that were pretty
simple. If you want nice clean sine wave ringing that's a little
harder, but with modern Arduous compatible boards being cheap it
shouldn't be too hard.<br>
<br>
It used to be you could buy ready to go central office telephone
line interface modules pretty cheaply but I have no idea if you
can still buy them. I do have a PAPER copy of the infamous "BOC
Notes on the LEC Networks" from Bell if anyone would like any info
from there.*<br>
<br>
* I used to be chief hardware engineer for a company making
central office stuff and also co-founded a computer voice over
POTS company. This was back when dinosaurs still used tin cans
with strings.<br>
</font><br>
<div class="moz-cite-prefix">On 4/10/20 1:47 PM, Don Taco via
Stagecraft wrote:<br>
</div>
<blockquote type="cite"
cite="mid:150316101.90146023.1586551655437.JavaMail.zimbra@peak.org">
<pre class="moz-quote-pre" wrap="">Well, for us little guys down in the low-budget trenches, there has never been an affordable unit, in my opinion. We were lucky enough to have a savvy volunteer rebuild a phone company unit from the 1950s, and we can plug a phone into that. No frills, no options.
----- Original Message -----
From: Nigel Worsley via Stagecraft <a class="moz-txt-link-rfc2396E" href="mailto:stagecraft@theatrical.net"><stagecraft@theatrical.net></a>
To: sdwheaton <a class="moz-txt-link-rfc2396E" href="mailto:sdwheaton@fuse.net"><sdwheaton@fuse.net></a>
Cc: Nigel Worsley <a class="moz-txt-link-rfc2396E" href="mailto:niglew@googlemail.com"><niglew@googlemail.com></a>, Stagecraft Mailing List <a class="moz-txt-link-rfc2396E" href="mailto:stagecraft@theatrical.net"><stagecraft@theatrical.net></a>
Sent: Fri, 10 Apr 2020 13:36:39 -0700 (PDT)
Subject: [ADV] Re: [SML] Telephone line simulator
On Fri, 10 Apr 2020 at 21:33, sdwheaton <a class="moz-txt-link-rfc2396E" href="mailto:sdwheaton@fuse.net"><sdwheaton@fuse.net></a> wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">A design for one appeared in Theatre Crafts, April 1989 issue by the list's very own Karl Ruling.
One feature he incorporated was to allow the ring cadence to be adjusted for a slow, ominous ring, or a faster, more urgent ring cadence.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
User programmable ring cadences is already on the list :)
Nigel Worsley
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Jerry Durand, Durand Interstellar, Inc. +1 408-356-3886
<a class="moz-txt-link-abbreviated" href="http://www.DurandInterstellar.com">www.DurandInterstellar.com</a> & <a class="moz-txt-link-abbreviated" href="http://www.Durandinterstellar.ru">www.Durandinterstellar.ru</a>
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