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

[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:                alecdavis
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Project:                    DAHDI-linux
Issue ID:                   17318
Category:                   NewFeature
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     closed
JIRA:                        
Reviewboard Link:           https://reviewboard.asterisk.org/r/797/ 
Resolution:                 fixed
Fixed in Version:           
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Date Submitted:             2010-05-11 06:12 CDT
Last Modified:              2010-07-23 05:36 CDT
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Summary:                    [patch] FXS Polarity Reversal on Hangup or Answer
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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---------------------------------------------------------------------- 
 (0124899) alecdavis (manager) - 2010-07-23 05:36
 https://issues.asterisk.org/view.php?id=17318#c124899 
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Additional note of implemented conditions:

with answeronpolarityswitch=yes and hanguponpolarityswitch=no
	Incoming/Outgoing setup
		on answer: Polarity reversed

	Remote party hangups first
		remote hangup: no change
		local hangup: Polarity normal

	Local party hangups first
		local hangup: Polarity normal

with answeronpolarityswitch=no and hanguponpolarityswitch=yes
	Incoming/Outgoing setup
		on answer: no change

	Remote party hangups first
		remote hangup: Polarity reversed
		local hangup: Polarity normal

	Local party hangups first
		local hangup: Polarity normal

with answeronpolarityswitch=yes and hanguponpolarityswitch=yes
	Incoming/Outgoing setup
		on answer: Polarity reversed

	Remote party hangups first
		remote hangup: Polarity normal
		local hangup: no change

	Local party hangups first
		remote hangup: Polarity normal 

Issue History 
Date Modified    Username       Field                    Change               
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2010-07-23 05:36 alecdavis      Note Added: 0124899                          
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