The Mediation Server provides media translation
and signaling between a media gateway such as the Audiocodes MP-114 in the sample
confi guration in this chapter and your Enterprise Voice infrastructure. The Mediation Server
is deployed inside your network, behind the fi rewall. The Mediation Server requires two network
interface cards (NIC) because one listens on one NIC secured with mutual Transport Layer
Security (TLS) that is connected to your OCS environment and a second NIC that is connected
to your gateway over an unsecured connection. Both NICs require a separate IP (Internet
Protocol) address. Because traffi c from the Mediation Server to the gateway is unsecured,
you may want to consider a VLAN or a separate network that provides more security on the
unsecured connection.
The Mediation Server??™s main functions are to translate SIP over the Transmission
Control Protocol (TCP) on the gateway side, and over mutual TLS on the Enterprise
Voice side. It also encrypts and decrypts the Secure Real-time Transport Protocol (SRTP)
on the Communications Server side, translates media streams between the media gateway
and the Communications Server, connects clients from outside the network to the internal
Interactive Connectivity Establishment components which enable media traversal fi rewalls,
and acts as a connector for calls from remote workers on the Enterprise Voice client.
OCS supports three different gateways: the Basic Gateway, which requires the use of a
separate Mediation Server; and the Basic Hybrid Media Gateway and Advanced Media Gateway,
which offer the Mediation Server built into a SIP-based Voice over IP (VoIP) gateway.
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