Merged revisions 202341-202342 via svnmerge from

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

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  r202341 | mmichelson | 2009-06-22 09:42:55 -0500 (Mon, 22 Jun 2009) | 26 lines
  
  Fix a situation in which Asterisk would not stop retransmitting 487s.
  
  If a CANCEL were received by Asterisk, we would send a 487 in response
  to the original INVITE and a 200 OK for the CANCEL. If there were a network
  hiccup which caused the 200 OK and the 487 to be lost, then the UA communicating
  with Asterisk may try to retransmit its CANCEL. Asterisk's response to this used
  to be to try sending another 487 to the canceled INVITE and another 200 OK to the
  CANCEL.
  
  The problem here is that the originally-sent 487 was sent "reliably" meaning that
  it will be retransmitted until it is received properly. So when we receive the second
  CANCEL it is likely that the first batch of 487s we sent is still going strong and
  reaches the UA. The result was that the second set of 487s would be retransmitted
  constantly until the maximum number of retries had been reached.
  
  The fix for this is that if we receive a second CANCEL for an INVITE, then we cancel
  the retransmission of the first set of 487s and start a second set. This causes the
  dialog to be terminated reasonably.
  
  (closes issue #14584)
  Reported by: klaus3000
  Patches:
        14584_v2.patch uploaded by mmichelson (license 60)
  Tested by: klaus3000
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  r202342 | mmichelson | 2009-06-22 09:44:58 -0500 (Mon, 22 Jun 2009) | 3 lines
  
  Remove an extra debug line left from previous commit.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@202343 65c4cc65-6c06-0410-ace0-fbb531ad65f3