Conferencing Servers, also known as multipoint control units (MCUs), manage the content for Office Communications Server 2007 R2 conferences. Office Communications Server 2007 R2 provides the following MCUs:
IM Conferencing Server
Web Conferencing Server
A/V Conferencing Server
Telephony Conferencing Server
Application Sharing Conferencing Server
Each of these server roles communicates directly with clients participating in a conferencing session. Each MCU uses its own protocol, which is optimized for the media it supports. These server roles also synchronize the state of the conference with a process called the focus that runs on the front-end server or Standard Edition Server. The protocol used to control the state of the conference ...