This means that an MCU needs some kind of mechanism to select which participant is to be showed. The RADVision MCU normally sends the image of the loudest speaker to all other H323 stations connected to the same meeting. A moderator, who overrules the build in automatic switching, can use a WWW interface to manually lock somebody's video. In this way, anybody knows that he or her is sending video. The sound of all participants in a meeting is mixed.
Any user can invite users.
This means that the RADVision MCU contacts the H323 end station. For conference monitoring, initiating data sharing and inviting new participants during ongoing conferences. Chair control including disconnecting parties and locking video streams. This SNMP based configuration software is divided into two parts. For every different conference setting, an entry is added with a unique conference prefix.