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asterisk/channels
Terry Wilson 7b410e570b Merged revisions 215758 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

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  r215758 | twilson | 2009-09-02 18:31:04 -0500 (Wed, 02 Sep 2009) | 25 lines
  
  Merged revisions 215682 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
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    r215682 | twilson | 2009-09-02 16:41:22 -0500 (Wed, 02 Sep 2009) | 18 lines
    
    Re-send non-100 provisional responses to prevent cancellation
    
    From section 13.3.1.1 of RFC 3261:
    
       If the UAS desires an extended period of time to answer the INVITE,
       it will need to ask for an "extension" in order to prevent proxies
       from canceling the transaction. A proxy has the option of canceling
       a transaction when there is a gap of 3 minutes between responses in a
       transaction. To prevent cancellation, the UAS MUST send a non-100
       provisional response at every minute, to handle the possibility of
       lost provisional responses.
    
    (closes issue #11157)
    Reported by: rjain
    Tested by: twilson
    
    Review: https://reviewboard.asterisk.org/r/315/
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