Supporting external user participation in Web conferencing requires a Web
Conferencing Edge Server. Making media such as audio and video available to external users
means that you need to deploy an A/V Edge Server. Of course, all three edge server roles
can be colocated on a single computer for a small deployment, or you might want to use a
load balancer with multiple servers to support even more users.
The last of our four major considerations is whether you are going to enable Enterprise
Voice. If so, you??™ll need two things: a media (IP/PSTN) gateway to handle calls between
users enabled for VoIP and the PSTN, and an OCS 2007 Mediation Server to handle the
traffi c between the gateway and your internal Communications Server infrastructure.
As discussed previously, there are three ways to deploy a Mediation Server and media
gateway. Those three options are to install a basic media gateway and a separate Mediation
Server; install a basic-hybrid gateway, in which the basic gateway and Mediation Server are
colocated on a single computer; and install an advanced media gateway, where the Mediation
Server logic is incorporated inside the gateway software.
You??™ll also need to plan for the normalization of the phone numbers you have stored in
your Active Directory and then create dial plans for each location where your organization
does business. To provide call answering, subscriber access, and auto-attendant services, you??™re
also going to need to deploy Microsoft Exchange Server 2007 UM and then confi gure
Exchange UM and Communications Server to work together.
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