Answer call requests by pressing M-key
From Zenitel Wiki
A call request is normally answered by pressing a dedicated DAK key programmed to dial the answer code 7638. But it is also possible to answer call requests by pressing M-key, in this way the operation will be the same as for direct calls in private ringing mode.
Event Handler
This is done using the Event Handler. Go to Exhcange&System from the top menu in AlphaPro:
From the Exchange&System window choose the Events button:
In the Event Actions window click the Insert button and create an event like this: