I just checked some screencaps of Trekcore. The room is clearly a fully built stage, with steps leading down to the conference table. Probably filmed on a soundstage, but yeah, that's how they do it. There are framed pictures of planets on the walls, and even some sort of entrance with white glass doors with the Starfleet logo on it, and 3dimensional letters saying "TO BOLDLY GO..." above the doors. LOL, you can even see someone sitting in the dark behind Kirk when he says "let them die." Is it Valeris? Would be great.