[asterisk-bugs] [Asterisk 0012865]: [patch] Don't send BYE for a dialog that already was terminated after blind transfer

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The following issue has been SUBMITTED. 
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http://bugs.digium.com/view.php?id=12865 
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Reported By:                flefoll
Assigned To:                
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Project:                    Asterisk
Issue ID:                   12865
Category:                   Channels/chan_sip/Transfers
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           SVN 
SVN Branch (only for SVN checkouts, not tarball releases):  1.4  
SVN Revision (number only!): 121495 
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             06-16-2008 04:27 CDT
Last Modified:              06-16-2008 04:27 CDT
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Summary:                    [patch] Don't send BYE for a dialog that already was
terminated after blind transfer
Description: 
__sip_autodestruct(), scheduled by sip_scheddestroy(), transmits a BYE
request if the call was formerly REFER'ed, even if the peer SIP device
already has terminated the dialog.

We can see it after a blind transfer where the transferer sends a BYE when
its REFER request has succeeded.
In this case, chan_sip handles the BYE request, marks the dialog as
ALREADYGONE, schedules dialog destruction (not immediate when no more
owner) and replies 200 OK.
Then, when __sip_autodestruct() runs, it generates a BYE request. In my
opinion, if the dialog is marked ALREADYGONE, then ... it's already gone !
And BYE is not required.
Of course, the result is 481 Call/Transaction Does Not Exist.

I propose to add a test of SIP_ALREADYGONE flag.

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Issue History 
Date Modified   Username       Field                    Change               
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06-16-08 04:27  flefoll        Asterisk Version          => SVN             
06-16-08 04:27  flefoll        SVN Branch (only for SVN checkou =>  1.4         
  
06-16-08 04:27  flefoll        SVN Revision (number only!) => 121495          
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