Unless this has changed, RuskDesk seems to require a TURN/ICE server to connect at all- you can’t directly connect via IP. This would be fine if you could run your own, but you can’t:

Open home page, "please set up your own server" Click link, second line "Note: You need buy license When using this software" Click link, "Currently we are not selling server licenses as we are working on a new version of the server. "

Combine this with the default server being slow and it’s unusable.