Merged revisions 187484 via svnmerge from

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

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  r187484 | mmichelson | 2009-04-09 13:51:20 -0500 (Thu, 09 Apr 2009) | 18 lines
  
  Handle a SIP race condition (reinvite before an ACK) properly.
  
  RFC 5047 explains the proper course of action to take if a 
  reINVITE is received before the ACK from a previous invite
  transaction. What we are to do is to treat the reINVITE as
  if it were both an ACK and a reINVITE and process it normally.
  
  Later, when we receive the ACK we had been expecting, we will
  ignore it since its CSeq is less than the current iseqno of
  the sip_pvt representing this dialog.
  
  (closes issue #13849)
  Reported by: klaus3000
  Patches:
        13849_v2.patch uploaded by mmichelson (license 60)
  Tested by: mmichelson, klaus3000
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