Merged revisions 209131 via svnmerge from

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

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  r209131 | mmichelson | 2009-07-27 12:44:06 -0500 (Mon, 27 Jul 2009) | 18 lines
  
  Allow for UDPTL to use only even-numbered ports if desired.
  
  There are some VoIP providers out there that will not accept SDP
  offers with odd numbered UDPTL ports. While it is my personal opinion
  that these VoIP providers are misinterpreting RFC 2327, it really is
  not a big deal to play along with their silly little games. Of course,
  since restricting UDPTL ports to only even numbers reduces the range
  of available ports by half, so the option to use only even port numbers
  is off by default. A user can enable the behavior by setting
  use_even_ports=yes in udptl.conf.
  
  (closes issue #15182)
  Reported by: CGMChris
  Patches:
        15182.patch uploaded by mmichelson (license 60)
  Tested by: CGMChris
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