[Asterisk-Dev] Openloop disconnect?

[David Hill]

I'm talking about CO decreasing voltage on the phone line thus 
signalling a hangup...

(something like that)

---->48v---->0v (for about 250-500ms)----->48v

That normally signify that the remote party has hanged up the line on 
their side.

http://www.sandman.com/cpcbull.html


<QUOTE>

*CPC (Calling Party Control)* is a signal sent from most modern 
electronic COs to indicate that the "Calling Party" has hung up. It's 
usually called *"Open Loop Disconnect"* when you're programming 
telephone equipment.

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 
/accidentally/ 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 *half a second.* 
That's /much/ more reliable.
</QUOTE>



Brian West wrote:

> Openloop?  Are you speaking of kewlstart?
>
> /b
>
> On Mar 25, 2005, at 6:33 PM, David Hill wrote:
>
>> Hello there,
>>
>>   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?
>>
>>   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.
>>
>>   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).
>>
>>
>> Thank you for your quick answer,
>>
>> Dave
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