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

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Connectivity to Edge Servers

When Lync Edge Servers are deployed in the environment, the Mediation Server service requires constant communication with the Edge Server. The Mediation Server acts much like a Lync client in regard to Edge Server connectivity. When the Mediation Server is establishing any call, it must allocate Media Relay ports with the Edge Server in the event that a remote user might be involved. When the call is made from an internal user, this still happens, and although the actual call might not fail, a delay in call setup time can occur.

A common issue with call setup delays is connectivity between Mediation Servers and Edge Servers. Ensure that the Mediation Server can communicate with the Edge Server on port 3478 UDP and ...

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