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I'm talking about CO decreasing voltage on the phone line thus
signalling a hangup...<br>
<br>
(something like that)<br>
<br>
---->48v---->0v (for about 250-500ms)----->48v<br>
<br>
That normally signify that the remote party has hanged up the line on
their side.<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.sandman.com/cpcbull.html">http://www.sandman.com/cpcbull.html</a><br>
<br>
<br>
<QUOTE><br>
<p align="left"><font face="Arial" size="2"><b>CPC (Calling Party
Control)</b> is a signal sent from most modern electronic COs to
indicate that the "Calling Party" has hung up. It's usually called <b>"Open
Loop Disconnect"</b> when you're programming telephone equipment.</font>
</p>
<p align="left"><font face="Arial" size="2">CPC is normally sent as an
open ranging from 250 to 500 milliseconds. Phone equipment at the far
end of the call sees this open on the line, and hangs up. Most voice
mail and phone systems have a timer setting for CPC. If you set it at
500ms, it usually works fine. If you <i>accidentally</i> set it for
50ms you'll probably get cut-offs, especially during a lightning storm
during very brief blips in the loop current. Setting this timer for
50ms means that if the phone equipment sees an open for 1/20th of a
second (not very long), it will hang up. Setting it for 500ms means it
will hang up if it sees an open of <b>half a second.</b> That's <i>much</i>
more reliable.<br>
</QUOTE><br>
</font> </p>
<br>
<br>
Brian West wrote:
<blockquote cite="midb2183cbe0c46375e63109fa263b8b7bb@mac.com"
type="cite">Openloop? Are you speaking of kewlstart?
<br>
<br>
/b
<br>
<br>
On Mar 25, 2005, at 6:33 PM, David Hill wrote:
<br>
<br>
<blockquote type="cite">Hello there,
<br>
<br>
I tried to found documentation about openloop disconnect on
Asterisk/Zaptel. And up to now, I didn't find anything. Is openloop
disconnect supported by zaptel/wcfxo drivers?
<br>
<br>
Other question: maxsilence and silencethreshold don't seem to have
any effect on voicemail. Could it be possible that in certain
situation it just wont work? I tried adding some verbose in app.c to
have the totalsilent variable printed out and it remains a 0 forever.
<br>
<br>
Finaly, does callprogress=yes should be working down here in Canada?
Actually, everything seems to be broken (the wildcard x100p or the
zaptel drivers plus a combination of many libraries/etc).
<br>
<br>
<br>
Thank you for your quick answer,
<br>
<br>
Dave
<br>
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