Add ringback and domain_uuid to the variables.


git-svn-id: http://fusionpbx.googlecode.com/svn/trunk/fusionpbx@3742 e2954ef0-caed-11de-bd98-e341d93cc3cc
Check variables correctly to see if ringback is already set.

git-svn-id: http://fusionpbx.googlecode.com/svn/trunk/fusionpbx@3743 e2954ef0-caed-11de-bd98-e341d93cc3cc