Expanded Confi guration enables your
organization to scale up specifi c A/V or Web conferencing requirements independently from
other Enterprise Edition server components. For example, if your A/V traffi c increases more
rapidly than other traffi c, you can meet this increase by deploying only additional A/V
Conferencing Servers rather than entire Front-End Servers.
OCS 2007 Server Roles
OCS 2007 conferences provide rich multimedia experiences that include data collaboration,
group IM, audio and video, and multiparty audio conferencing. For each media type there is
a corresponding conferencing server, or multipoint control unit (MCU), that manages and
46 Chapter 2 ??? Microsoft Offi ce Communications Server 2007
coordinates the use of that media type during the course of a meeting. OCS 2007 ships with
four conferencing servers:
?– IM Conferencing Server Provides server-managed group IM
?– Web Conferencing Server Enables multiparty data collaboration
?– A/V Conferencing Server Enables audio conferencing and videoconferencing
?– Telephony Conferencing Server Enables audio conference integration with
audio conferencing providers (ACPs)
Front-End Server
The IM Conferencing Server and Telephony Conferencing Server always run as separate
processes on the Standard Edition server or Enterprise Edition Front-End Server. The Web
Conferencing Server and A/V Conferencing Server can optionally be deployed on separate
computers within an Enterprise pool.
With both the OCS 2007 Standard and Enterprise editions, the Front-End Server is
responsible for the following tasks:
?– Handling signaling among servers and between servers and clients
?– Authenticating users and maintaining user data, including all user endpoints
?– Routing VoIP calls within the enterprise and to the PSTN
?– Initiating on-premises conferences and managing conference state
?– Providing enhanced presence information to clients
?– Routing IM and conferencing traffi c
?– Managing conferencing media
?– Hosting applications
?– Filtering SPIM (unsolicited commercial IM traffi c)
Edge Server
An edge server is an OCS that resides in the perimeter network and provides connectivity
for external users and public IM connections.
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