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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 Next-Hop Gateways

Given the Mediation Server’s role of providing PSTN connectivity through a next-hop gateway, ensuring that connectivity to those next-hop services is healthy is important in all troubleshooting scenarios. Lync Server 2013 maintains health monitoring of these connections by default, and it does so in two ways:

SIP OPTIONS Requests—The Mediation Server continuously communicates with the next-hop gateway through SIP OPTIONS requests. These exchanges are a method of validating a healthy connection between the two services. If these messages fail to be exchanged, Lync Server 2013 will alert administrators through the Lync Server Event Log. For information on checking this log, see the “Logs” section.

Routing Timeouts— ...

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