[asterisk-users] US T1 Hangup Detection

[Jason Aarons (US)]

Digital ISDN used Q931 messages.  You should get a disconnect message
from telco on the d-channel 23.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Daniel
Hazelbaker
Sent: Monday, July 07, 2008 4:39 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] US T1 Hangup Detection

We are in the process of preparing to move our Asterisk server to a  
Digital T1 interface card instead of a analog card (via an Adtran  
which is now connected to the T1).  I did a preliminary test the other  
day and hooked the T1 line up to the T1 card, bypassing the Adtran.   
This worked rather well I must say.  The two issues I ran into are:

1) Caller ID is not working even though I enabled it. I simply do not  
see _anything_ related to caller ID going on. (not major, I am not  
even sure the phone company has it setup properly so I need to talk to  
them first, Verizon)

2) Asterisk is not detecting the far end hangup.  Through the Adtran  
it does, but direct digital it does not.  I bridged an incoming call  
to an analog phone and listened as I hung up the far end (cell-call).   
I hear a audible "click", silence, and then after maybe a half second  
I hear dialtone.  I tried turning on hanguponpolarity switch, tried  
turning it off, tried turning callprogress on and off, still does not  
detect the hangup.  Am I missing something obvious in Asterisk (this  
is my first digital hookup)?  I read somewhere that Asterisk is  
already suppose to detect dialtone to know that the far-end hungup.   
Do I need to call my phone company and get details on exactly how they  
are triggering the hangup, though I would think with digital it "just  
happens").

Daniel

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