The conference room feature of your ComPBX works to create a meeting room whereby users (both internally and externally) can call in and talk to one another.
Conference rooms can be moderated by an admin user and can be password protected to prevent unwanted callers from accessing it. The conference room can be accessed by users internally by dialling the conference room access number. The conference room can be accessed by external users by entering a numerical code after dialling a number.
For example, your conference room can be linked to your IVR message without anyone ever knowing. A caller would dial your regular business number, and once they reached the IVR message, they would enter the access code (#XXX) followed by the password, and they would be connected to the conference room.