Hi,
I didn't find any way to force user to use one of the definedrooms. That works well for text clients (Spark, Adium, Web, Pidgin, etc): they can only use the rooms that are listed. But with ofmeet, no way, rooms are dynamically assigned and anyone can type anything following /ofmeet/ URL.
I can imagine that's the way it was designed but in a corporate environment having virtual things behaving the same way their physical counterpart works is a better thing.
Thanks,
db