[asterisk-bugs] [Asterisk 0014163]: [patch] UK (BT) lines produce uncleared red alarm on TDM400P during line tests

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=14163 
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Reported By:                jedi98
Assigned To:                sruffell
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Project:                    Asterisk
Issue ID:                   14163
Category:                   Channels/chan_dahdi
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     ready for review
Target Version:             Potential Blocker
Asterisk Version:           SVN 
JIRA:                       SWP-22 
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2009-01-02 10:29 CST
Last Modified:              2009-12-11 04:12 CST
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Summary:                    [patch] UK (BT) lines produce uncleared red alarm on
TDM400P during line tests
Description: 
Asterisk: 1.4.22, dahdi-linux: 2.1.0.3

The automatic overnight line tests (or manual ones) used on UK (BT) lines
causes a red alarm on a dahdi / TDM400P connected channel. This is because
the line uses voltage tests (battery loss) and polarity reversal. The
polarity reversal causes chan_dahdi to initiate v23 CallerID processing but
during this the event DAHDI_EVENT_NOALARM is ignored so that the alarm is
never cleared.

All this means that the channel is unusable until a "dahdi restart"
occurs.

I have a patch for chan_dahdi which works well for me but it's not the
nicest solution an it needs more people to test / refine. I will attach the
patch.

Syslog: -
Dec 29 22:09:56 39net-server2 kernel: NO BATTERY on 1/3!
Dec 29 22:09:58 39net-server2 kernel: 436822404 Polarity reversed (-1 ->
1)
Dec 29 22:09:58 39net-server2 kernel: BATTERY on 1/3 (+)!
Dec 29 22:10:00 39net-server2 kernel: NO BATTERY on 1/3!
Dec 29 22:10:02 39net-server2 kernel: 436823620 Polarity reversed (1 ->
-1)
Dec 29 22:10:03 39net-server2 kernel: BATTERY on 1/3 (-)!
Dec 29 22:10:05 39net-server2 kernel: NO BATTERY on 1/3!
Dec 29 22:10:05 39net-server2 kernel: 436824308 Polarity reversed (-1 ->
1)
Dec 29 22:10:07 39net-server2 kernel: BATTERY on 1/3 (-)!
Dec 29 22:10:07 39net-server2 kernel: 436824688 Polarity reversed (1 ->
-1)

Asterisk log: -
[Dec 29 22:09:57] WARNING[10309]: chan_dahdi.c:3784 handle_alarms:
Detected alarm on channel 3: Red Alarm
  == Starting post polarity CID detection on channel 3
    -- Starting simple switch on 'DAHDI/3-1'
[Dec 29 22:09:59] NOTICE[10332]: chan_dahdi.c:6319 ss_thread: Got event 5
(No more alarm)...
[Dec 29 22:10:01] WARNING[10332]: chan_dahdi.c:6380 ss_thread: CID timed
out waiting for ring. Exiting simple switch
    -- Hungup 'DAHDI/3-1'
[Dec 29 22:10:01] WARNING[10309]: chan_dahdi.c:3784 handle_alarms:
Detected alarm on channel 3: Red Alarm
  == Starting post polarity CID detection on channel 3
    -- Starting simple switch on 'DAHDI/3-1'
[Dec 29 22:10:03] NOTICE[10333]: chan_dahdi.c:6319 ss_thread: Got event 5
(No more alarm)...
[Dec 29 22:10:06] WARNING[10333]: chan_dahdi.c:6380 ss_thread: CID timed
out waiting for ring. Exiting simple switch
    -- Hungup 'DAHDI/3-1'
[Dec 29 22:10:06] WARNING[10309]: chan_dahdi.c:3784 handle_alarms:
Detected alarm on channel 3: Red Alarm
  == Starting post polarity CID detection on channel 3
    -- Starting simple switch on 'DAHDI/3-1'
[Dec 29 22:10:08] NOTICE[10334]: chan_dahdi.c:6319 ss_thread: Got event 5
(No more alarm)...
[Dec 29 22:10:10] WARNING[10334]: chan_dahdi.c:6380 ss_thread: CID timed
out waiting for ring. Exiting simple switch

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---------------------------------------------------------------------- 
 (0115138) mikeeccleston (reporter) - 2009-12-11 04:12
 https://issues.asterisk.org/view.php?id=14163#c115138 
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We have had a problem with a TDM400 card with the 3 POT lines on BT lines.
The CID was detected correctly but randomly the call was then not passed
on to the call plan. Asterisk had to be restarted to solve the problem.
I have applied the patch for Asterisk 1.4 chan_dahdi to version 1.4.27.1
which patched, compiled and installed correctly. 
The patch seems to have resolved the problem as the asterisk server has
been running for a week without problem on the TDN400 card with the 3 POT
lines.

Thanks for the patch. 

Issue History 
Date Modified    Username       Field                    Change               
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2009-12-11 04:12 mikeeccleston  Note Added: 0115138                          
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