1
general::
Phrase(s): *above and beyond (something)
more than is required; greater than the required amount. (*Typically: be ~; go ~.) • The English teacher helped students after school every day, even though it was beyond the call of duty.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
More than is required. This somewhat redundant expression? above and beyond here both denote excess? often precedes the call of duty, which means exceeding what a particular job requires. Thus Putting in overtime without pay is above and beyond the call of duty. Also see OVER AND ABOVE.
American Heritage Idioms