Each edge server has one or more of
the following roles: Access Edge Server, Web Conferencing Edge Server, or A/V Edge
Server.
Edge servers enable your internal and external users to communicate using the MOC
2007 or Live Meeting 2007 client. Depending on your needs, you install edge servers in one
or more of the following roles:
Microsoft Office Communications Server 2007 ??? Chapter 2 47
?– Access Edge Server This used to be known as the Access Proxy. The main thing
to know here is that this server handles all SIP traffi c across your corporate fi rewalls.
This SIP traffi c is required to set up and validate connections. It doesn??™t handle
data transfer and it doesn??™t authenticate users. Active Directory access is required
to perform authentication. Authentication of inbound traffi c is performed by the
Director or the Front-End Server. A Director is an OCS 2007 Standard Edition
server or Enterprise pool that doesn??™t host users and that resides inside an organization??™s
fi rewall. Having a Director is not mandatory, but it is strongly recommended.
Keep in mind that the Director role is used to route traffi c to the proper
pool or server. It also acts as a middleman between the Access Proxy role and other
front-end servers. If a hacker manages to get in and compromises an Access Proxy
server, he can??™t bring down Active Directory or any of the front-end servers. That??™s
because the Director role takes the main force of any potential denial-of-service
(DoS) attack.
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