these two cases do not need to be on IF the flag is set otherwise you can't LIE about the contact dyanmically.  These are the TWO cases that had a not PFLAG_AUTO_NAT else do the right thing in this case.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15870 d0543943-73ff-0310-b7d9-9358b9ac24b2