Fix a problem where the if the last phone ringing is not registered then the call ends with error user not registered. Fixed a problem where the last person rejects the call it would send a busy back to the caller rather than sending to the timeout action.

git-svn-id: http://fusionpbx.googlecode.com/svn/trunk@4668 e2954ef0-caed-11de-bd98-e341d93cc3cc