so i install ms communication server 2007 r2 and ms office communicator 2007 r2 for three user. so it is possible now to send video call from one person to another. you can use it so way: you choose a person from your contact list and from context menu choose 'send video call'. but when i choose several persons which I want to talk by video this option doesn't exist. (but it should be - http://www.useto.ru/images/01/image015.jpg). what is the problem and how can i tune up communication server or communicator for ability to send video call to several persons?