[asterisk-users] US T1 Hangup Detection

[Daniel Hazelbaker]

Another update on the latest hookup attempt.  I can make it work  
reasonably well with callprogress=yes, it detects the hangup but only  
after about 7-9 seconds.  My config files are the same as the last  
time I posted (apparently last time I wasn't waiting long enough for  
callprogress to kick in).  If I turn callprogress=off then it never  
hangs up, if I turn it on, again after 7-9 seconds, it will hangup.   
My current Adtran unit hangs up almost instantly, so I think it is  
getting and detecting the "disconnect supervision" correctly.

I am going to try again in a few days, but I want to make some  
modifications to the zaptel driver (add in some debug code) and revert  
to Asterisk 1.4, not that I expect that to make a difference but I'll  
try anything at this point.  Before I do a question:

I am using esf,b8zs signalling on a true(/inband) T1 line.  Does the  
Zaptel driver use the rxwink timing to detect a hangup by the  
disconnect supervision?  If not, what does it use as it must be able  
to tell the difference (and I am using analog terms here) between a  
hangup and a "flash" for 3-way calling.

Thanks again.  If I can't figure this out I will have to call them  
out, but I don't think they will do anything other than say "yep it  
works on our side, fix your own equipment."

Daniel

On Jul 8, 2008, at 1:11 PM, Daniel Hazelbaker wrote:

> Just an update for the information I got from Verizon:
>
> It is a "true" T1, not a PRI for sure.  b8zs and esf signalling.  It
> is loop start with disconnect supervision (kewlstart as I understand
> it).  I know I had already tried kewlstart before, but I suppose it is
> possible that some other configuration option was making it not work.
> Since the only T1 line I have coming in is our live phone lines I will
> have to test this again late some night this week, so if somebody has
> an idea of some things to check while I am doing that I will certainly
> give it a shot, otherwise I will report back afterwords if I had
> success.