fixed hicom busy bug, we now see if the systemphone is busy, also fixed the...

fixed hicom busy bug, we now see if the systemphone is busy, also fixed the immediate=yes does not work anymore issue

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@15220 65c4cc65-6c06-0410-ace0-fbb531ad65f3