Sub-Event (Event Handler)
From Zenitel Wiki
Some Main Events are divided into SubEvents. Subevent is a number from 0 to 255.
Subevents are mainly used for the EventTrigger, timeout and EDI events.
For station-related events, Sub Event = 255 is used as the Match-All number. The macro %sev can be used to extract the subevent number of the actual event in the action string.
For EDI, Sub Event = 0 matches inputs on all EDI ports.