Mediation Server - Nortel 1000 Fundamentals

20 Converged Office component overview
Media gateways translate the following protocols between the
circuit-switched PSTN network and the packet-switched Enterprise Voice
infrastructure:
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From the Nortel perspective, the CS 1000 functions as a media gateway for
the clients of the OCS 2007 server.

Mediation Server

The Mediation Server provides signaling and media translation between the
Enterprise Voice infrastructure and a CS 1000 gateway.
Figure 3
CS 1000 and OCS 2007 logical network elements
The Mediation Server provides the following functions:
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Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007
Copyright © 2005–2008, Nortel Networks
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Signaling protocol—SS7 and other protocols on the PSTN translate
to SIP for Enterprise Voice
Transport protocol—T-Carrier or E-Carrier on the PSTN convert to RTP
or Secure Real-Time Transport Protocol (SRTP) for Enterprise Voice
translates SIP over Transport Control Protocol (TCP) (on the CS 1000
gateway side) to SIP over mutual Transport Layer Security (TLS) on the
Office Communications Server side
encrypts and decrypts SRTP on the Office Communications Server side
translates media streams (G.711) on the CS 1000 gateway side and RT
Audio on the Office Communication Server side
Nortel Communication Server 1000
NN43001-121 01.03 Standard
Release 5.0 30 April 2008