If you are diverting a VoIP line onto another VoIP line and you still want to see the call pop up alert feature for your line on your screen then please make sure that you have entered the 6 digit extension line number of the line you are diverting onto as shown in the example below:
If instead you have entered the full VoIP line number (rather than the 6 digit extension line) the call pop up alert on screen will not be shown.