Progress messages don't work

(closes issue #10497)
 Reported by: pj
 Patches: 
       h323-announces-r99483.diff uploaded by sergee (license 138)
 Tested by: pj


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@99860 65c4cc65-6c06-0410-ace0-fbb531ad65f3