Real Dictionary

roll call
variable noun: If you take a roll call, you check which of the members of a group are present by reading their names out.

roll call in American English
the reading aloud of a roll, or list of names, as to check attendance in a classroom, military formation, etc.
noun: the calling of a list of names, as of soldiers or students, for checking attendance

roll call in British English
noun: the reading aloud of an official list of names, those present responding when their names are read out