From Zenitel Wiki
From the Event Handler of the ICX-AlphaCom one can generate ASCII strings to be sent out on the EDO port, which can trigger e.g. automatic video pop-up in the exacqVision when a call is established.
When used with the ICX-AlphaCom System, the following license is required in the ICX in order to enable the EDO port: 1002602400 - ILI-IF Interface enabling
For more information see the Zenitel Integration Guide from Exacq.