When an address uses EffectiveSchedules, you may wish to override those schedules for particular messages. For example, if a message has the maximum severity of 9, you may want to deliver it even at a time when the address does not normally accept notifications. 

To override the effective schedules, use the ScheduleOverrideComparison and ScheduleOverrideSeverity. These values work just like UseForSeverityComparison and UseForSeverity, except that they determine whether the schedules will be overridden, not whether the message will be sent. 

If a message's severity does not meet the rule defined by UseForSeverityComparison and UseForSeverity it will not be sent, regardless of the effective schedule or override settings.

Set the value to compUnspecified if you do not want to override the schedules.

UseForSeverityComparison,EffectiveSchedules,INotificationAction.Severity,IFileCaptureAction.Severity