1 - Private; can be entered by guessing the room's name
2 - Private; can be entered by knowing the name *and* password
3 - Private; invitation only (sometimes called "exclusive")
+ 4 - Personal (mailbox for this user only)
3 - Password for new room (if it is a type 2 room)
4 - Floor number on which the room should reside (optional)
5 - Set to 1 to avoid automatically gaining access to the created room.