Missed calls
From Zenitel Wiki
In AlphaCom there is no standard feature for displaying Missed calls, but by using the Event Handler, one can create such function.
The Missed Calls feature is applicable for calls in private ringing mode. If a call is not answered (either by timeout of the ringing, or the caller hangs up), a display message will be generated, showing that there is a missed call. The user can then dial 70 to read the missed calls on his station.