W56H display goes off during active call

[Teho]

Hi, I'm new here and not used to posting on forums.
Is there a way of having the screen display stay on during active call? on W56H handset? Displays goes black after 60 seconds during the call. I tried screen saver, ECO and ECO+ settings but still the same. I understand saving battery when not in use but not during an active call.