[asterisk-bugs] [Asterisk 0012453]: British Telecom line testing causes segfault on chan_zap.c

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=12453 
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Reported By:                Alex728
Assigned To:                
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Project:                    Asterisk
Issue ID:                   12453
Category:                   Channels/chan_zap
Reproducibility:            always
Severity:                   crash
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.19 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             04-15-2008 19:39 CDT
Last Modified:              04-16-2008 17:24 CDT
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Summary:                    British Telecom line testing causes segfault on
chan_zap.c
Description: 
Telephone lines in the UK are subjected to various automatic line tests in
the evening. These include a polarity reversal, and alternate application
of earth and battery (-48V) to the A and B wires (Tip and ring) 

Since version 1.4.18 of Asterisk, these conditions are detected first as a
spurious zaptel alarm, then a polarity reversal before caller ID. For some
reason this causes chan_zap.c to crash with a segmentation fault.

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---------------------------------------------------------------------- 
 stever28 - 04-16-08 17:24  
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I have the same problem which first appeared when upgrading zaptel from
1.4.8 to 1.4.9, tried 1.4.9.2 and same problem.  Went back to 1.4.8 and all
ok again.  Now I'm on 1.4.10 and haven't yet had a problem, but then call
logs don't show any BT test calls since upgrading.  I'll keep watching to
see what happens next time BT test the line, it's usually between 2.00 and
3.00AM.  Only happens on single del connected to tdm022b. 

Issue History 
Date Modified   Username       Field                    Change               
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04-16-08 17:24  stever28       Note Added: 0085588                          
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