Merged revisions 219450 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r219450 | dvossel | 2009-09-18 11:19:15 -0500 (Fri, 18 Sep 2009) | 14 lines
  
  via-header branches not updated correctly on INVITE
  
  INVITE requests must always contain a new unique branch id. When
  a new branch id is created for an INVITE, the dialog's invite_branch
  variable must be updated so CANCEL requests use the correct branch id.
  
  (closes issue #15262)
  Reported by: maniax
  Patches:
        asterisk-1.6.1.0-sip-branch.patch uploaded by tweety (license 608)
        invite_new_branch_trunk.diff uploaded by dvossel (license 671)
  Tested by: maniax, dvossel
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@219451 65c4cc65-6c06-0410-ace0-fbb531ad65f3