An integer from 1 to 1073741824 that uniquely identifies a particular alarm notification for the reporting network element for as long as correlation to it remains meaningful. Admins and correlation logic use this ID to reference a specific alarm instance later, such as when a subsequent notification needs to clear or correlate against it. For example, a later alarm's nortelNMInotifyAlarmCorrelationIdList might reference this notification ID to indicate it supersedes or clears this earlier alarm.