[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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http://bugs.digium.com/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
Asterisk Version:           1.4.22 
Regression:                 No 
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:              2009-04-13 13:10 CDT
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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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---------------------------------------------------------------------- 
 (0103164) jedi98 (reporter) - 2009-04-13 13:10
 http://bugs.digium.com/view.php?id=14163#c103164 
---------------------------------------------------------------------- 
There's a bug report (12531) for "UK CallerID on TDM400P not reliable". 

By the way, if you have a patch for UK CID that has this comment in it "/*
Ignore ring before end of cid 'slot' (955ms = 7640 @ 8K samples/sec) */",
then it's probably the one I wrote back in mid 2006 and have used ever
since. 

Issue History 
Date Modified    Username       Field                    Change               
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2009-04-13 13:10 jedi98         Note Added: 0103164                          
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