Modify externnotify to take the number of urgent voicemails as a final argument instead

of the string "Urgent" 

(closes issue #12660)
Reported by: jaroth
Patches:
      externnotify.patch uploaded by jaroth (license 50)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@116592 65c4cc65-6c06-0410-ace0-fbb531ad65f3