Merged revisions 315894 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r315894 | mnicholson | 2011-04-27 14:14:27 -0500 (Wed, 27 Apr 2011) | 28 lines
  
  Merged revisions 315893 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
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    r315893 | mnicholson | 2011-04-27 14:03:05 -0500 (Wed, 27 Apr 2011) | 21 lines
    
    Merged revisions 315891 via svnmerge from 
    https://origsvn.digium.com/svn/asterisk/branches/1.4
    
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      r315891 | mnicholson | 2011-04-27 13:57:56 -0500 (Wed, 27 Apr 2011) | 14 lines
      
      Fix our compliance with RFC 3261 section 18.2.2.
      
      This change optimizes the free_via() function and removes some redundant null
      checking. It also fixes compliance with RFC 3261 section 18.2.2 by always using
      the port specified in the Via header for routing responses (even when maddr is
      not set). Also the htons() function is now used when setting the port.
      Additional documentation comments have been added in various places to make the
      logic in the code clearer.
      
      (closes issue #18951)
      Reported by: jmls
      Patches:
            issue18951_set_proper_port_from_via.patch uploaded by wdoekes (license 717) (modified)
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@315895 65c4cc65-6c06-0410-ace0-fbb531ad65f3