how to choose a specific number of user for a specfic room

[zinkprod]

Hi,

I have to know if it's possible to choose a number of user for each room on my spreed-webrtc server.
For exemple, i need a room with only 2 users on it. How can i prevent another user to log in on this room ? Have you an admin/user guide/tutorial where i can found all information i need ?
Thank you,

ZinK