Some small tweaks regarding realtime conference announcements.

(closes issue #13522)
Reported by: DEA
Patches:
      meetme-rt-fixes.txt uploaded by DEA (license 3)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@147714 65c4cc65-6c06-0410-ace0-fbb531ad65f3