Timeout of conversation (Event Handler)
From Zenitel Wiki
Using the $ST (Set_Timer) message.
Timeout of incoming calls to one specific station:
If the conversation timeout should apply for outgoing calls as well, add the following events:
If the timeout should apply to a number of stations the easiest way is to assign the stations concerned to a UDP group, and then set the UDP group as Event Owner instead of the 'The station' in the above events.