[asterisk-bugs] [DAHDI-linux 0017318]: FXS Polarity Reversal on Hangup

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=17318 
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Reported By:                armeniki
Assigned To:                
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Project:                    DAHDI-linux
Issue ID:                   17318
Category:                   NewFeature
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
JIRA:                        
Reviewboard Link:            
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Date Submitted:             2010-05-11 06:12 CDT
Last Modified:              2010-06-17 06:03 CDT
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Summary:                    FXS Polarity Reversal on Hangup
Description: 
FXS lines normally connect to a telephone.  However, when FXS lines are
routed to an external PBX or Key System to act as "external" or "CO" lines,
it is extremely difficult, if not impossible for the external PBX to know
when the call has been disconnected without receiving a polarity reversal
on the line.

DAHDI/Asterisk should have a feature to allow a setting someplace, perhaps
in chan_dahdi.conf, to allow a FXS channel to provide a polarity reversal
on channel hangup.
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 (0123525) davidw (reporter) - 2010-06-17 06:03
 https://issues.asterisk.org/view.php?id=17318#c123525 
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Note #https://issues.asterisk.org/view.php?id=121763 seems to be limited to
phones for the North American market. 
The UK PSTN uses a line reversal at the start of calling to phones with
caller id presentation. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-06-17 06:03 davidw         Note Added: 0123525                          
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