Hi, check the following comments. hopefully it can help you out. ------------------------------------------------------------------发件人:Tech Developer <simatechdevelo...@gmail.com>发送时间:2016年6月10日(星期五) 13:42收件人:user <user@openmeetings.apache.org>主 题:Om - regards Hi sir, I have some soubts in om.. 1. On creating new room via calendar i have seen Room types, they are a) conferenence (1-25 users) - is it 25 - max allowed users, is all users got whiteboard video audio facility? //This type is corresponding to "public conference room" which you can make modification by admin account. // All you need to do is click "Administration"->"Conference rooms" . I believe all users in this room got whiteboard video audio facility by default b) restricted (1 - 150 users)- is it 150 - max allowed users, is all users got whiteboard video audio facility? //This type is corresponding to "public Restricted room". Default number of users is 100 and you can make modifications. //all users in this room got whiteboard video audio facility by default c) interview 1:1 meeting with recording //This type is corresponding to "public Interview room". and notification type iCal email, simple mail, do not send notification - what this mean? //When you enter the room as a "moderator", click the button "you need choose the user for this video" //depends on which notification method you set when created the room, system will send a notification email, either iCal email or simple email, or no notification email will be sent.