As a follow-up, I have traced the PRI connection and discovered that calls hung up by a local BCM voice station (analog, digital, whatever) send a disconnect with a clear cause of 1 (Number not assigned) instead of a normal clear cause of 16. Calls forwarded through the BCM disconnect with the normal clear cause.
I have kludged up a fix to change all clear causes below 2 to 16 (I placed "if (icause <= 1) icause = 16;" after line 2506 in channels/chan_zap.c (version 1.2.5)). I am waiting to see if it solves the D-channel drops.
As an aside, I have noted that calls that are hung up before completion, from either the Definity or the BCM, clear with a cause of -1. This can hang a channel on the Definity side as well.
Mark.
________________________________
From: McQuiggan, Mark xt46480
Sent: Monday, March 13, 2006 4:20 PM
To: 'asterisk-users@lists.digium.com'
Subject: Calls not tearing down properly
I have the following configuration:
Bell CO. <---ISDN---> Definity <---ZAP PRI---> Asterisk <--ZAP PRI---> Nortel BCM.
With SIP users on the Asterisk box.
I have found a problem with call tear-downs. When a caller calls in from Outside, or from a Definity station to a BCM station, _and_ the BCM hangs up first, the Definity - Asterisk call does not tear down properly. I get a problem tone on the Definity station, or a "not in service" message from Bell for outside callers.
All other calls tear down properly, in either direction, no matter who calls or who hangs up first.
I have been having problems with my Definity Asterisk connection dropping its D-channel (and all connections existing at the time of the D-channel drop). I believe that they may be linked. In using gdb, I was seeing problems with pri_disconnect_timeout.
Please help.
Regards,
Mark.
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