On the
gateway side, the Mediation Server listens on a single Transmission Control Protocol/
Internet Protocol (TCP/IP) transport address.
The main functions of the Mediation Server are as follows:
?– Translating SIP over TCP (on the gateway side) to SIP over mutual TLS (on the
Enterprise Voice side)
?– Encrypting and decrypting SRTP on the OCS side
?– Translating media streams between OCS and the media gateway
?– Connecting clients that are outside the network to internal ICE components,
which enable media traversal of NAT and fi rewalls
?– Acting as an intermediary for call fl ows that a gateway does not support, such as
calls from remote workers on an Enterprise Voice client
From the perspective of the Enterprise Voice infrastructure, the combination of the basic
media gateway and Mediation Server appears as a single entity. Together, they are the logical
and functional equivalent of an advanced media gateway. When advanced media gateways
become available, enterprises that deploy them no longer need a dedicated Mediation Server.
Meanwhile, the basic-hybrid media gateway provides an interim solution for organizations
that prefer to avoid deploying and managing a gateway and Mediation Server separately.
A typical organization supports multiple gateway??“Mediation Server combinations, depending
on the number of offi ce locations, the number and distribution of Enterprise Voice users,
network traffi c, and performance requirements.
Microsoft Office Communications Server 2007 ??? Chapter 2 49
Archiving and CDR Server
The Archiving and CDR Server provides the following capabilities:
?– Archiving of all IM conversations for all users or for individual users that you specify
?– Archiving of CDRs for all users
Messages from the OCS Front-End Server are sent through the Windows Server Message
Queuing service to the Archiving and CDR Server, which uses a Microsoft SQL Server
database to store archived information.
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