When you have a group for either user or device purposes and you check off permission only. Example, Administration Dept (filled with our VP's and CEO), users calling that group should get "Im Sorry this group isn't callable" where as it says now "I didn't understand" which frustrates the user as they think the group is callable.  Also in the group profile, where you check off Permisson Only, it should also state beside Not Callable but something along the lines that users can still find out what groups they are in.