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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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Media Bypass

One of original roles of the mediation server was to transcode between RealTime audio (RTAudio) and G.711 to integrate with standards-based media gateways and PBXs. With Lync Server, calls can be sent using G.711 directly to a supported gateway or PBX. Although low bandwidth signaling (SIP) still traverses the mediation service role, higher bandwidth media (RTP) flows directly from a Lync Server endpoint to the GW/PBX, bypassing the Mediation Server role.

This change provides several benefits, including

• Removes a potential single point of failure that a mediation server introduced

• Reduces the overall server footprint of OCS

• Reduces the number of hops a media stream takes

In addition, in scenarios where a branch appliance is ...

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