The intercom in a Command Tiger, like every other Command Panzer since 1942, was an advanced system not used in normal Panzers. It had three voice channels and signal lamps.
The system featured four large switch boxes, similar to this one, located at the various crew members. Plus, the driver had a smaller box, and the commander had an extra lamp box.
But Ustar don't seem to be including the Command intercom in their Command Tiger. For example, this is the left inner side of their turret. They are still using the two small intercom boxes (arrowed) from their original Tiger kit. These boxes did not exist in a Command Tiger.