If Deskphone is chosen under the "Call using" section of Virtual Office Desktop, the phone keypad does not show up on Virtual Office Desktop screen and there's no way to see it.
Virtual Office Desktop (VOD).
On the right side of the search bar, click the "Call Using" Icon highlighted in red square in the image below.
Choose "Computer" and click on the X at the top right corner.
Top banner should now display the monitor icon idicating "Call using....Computer"
Keypad will now show up as an option.
Please note that if the call is answered and controlled from Virtual Office Desktop, it will not show up on the deskphone.
To take over an active call on another endpoint (VOD, VOM, Deskphone) see KB article regarding Call Flip: