Create rules for disallowing contacts at certain addresses, which may

Create rules for disallowing contacts at certain addresses, which may
improve the security of various installations.  As this does not change
any default behavior, it is not classified as a direct security fix for
anything within Asterisk, but may help PBX admins better secure their
SIP servers.
(closes issue #11776)
 Reported by: ibc
 Patches:
       20080829__bug11776.diff.txt uploaded by Corydon76 (license 14)
 Tested by: Corydon76, blitzrage

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@142865 65c4cc65-6c06-0410-ace0-fbb531ad65f3