Ability has been added to both manager command SIPnotify as well as console
command sip notify. Message body is stored in the "Content" variable. An 
example is present in sip_notify.conf.

(closes issue #13926)
Reported by: jthurman
Patches:
      sip-notify-svn189463.diff uploaded by gareth (license 208)
Tested by: gareth


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@224035 65c4cc65-6c06-0410-ace0-fbb531ad65f3