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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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Mediation Server Overview

The Mediation Server in Microsoft Lync Server 2013 is a service that connects your Lync users and Lync Servers to the PSTN. This server role is required for any connections to the PSTN or a legacy PBX infrastructure. When organizations are planning to deploy Enterprise Voice or Dial-In Conferencing, a Mediation Server must be deployed and connected to a next-hop PBX or PSTN. There are various ways to connect to the PSTN, including a PSTN Gateway, an IP-PBX, as Session Border Controller (SBC), or directly to a SIP trunk. Details on planning and designing PSTN connectivity for your infrastructure can be found in Chapter 32, “Planning for Voice Deployment.”

The Mediation Server is a back-to-back user agent (B2BUA). A B2BUA ...

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