is it possible to connect 3 x kv6113 with 1 x kh6320-wte1, seem to be having issues and using the latest firmware i believe, user only wants 1 screen with intercoms on 3 x different entry points
is this setup on a location? Maybe you could set other two as slave with setting Door No.1 and second Door No.2 under device management.
I don't have any here, you could screenshot intercom page setting on browser.
You will need to configure one of the Door Stations as a Main Door Station as Device ID "0" & the other two as Sub-Door Stations as Device ID "1" & "2", making sure you point the Sub-Door Stations & the Indoor Station to the Main Door Station IP Address under the Linked Network as shown in the Diagram