There was no response from a Trunk to an OPTIONS request sent by the Mediation Server. The Trunk, %1, is not responding to ...

Lync Server 2013

There was no response from a Trunk to an OPTIONS request sent by the Mediation Server.

The Trunk, %1, is not responding to an OPTIONS request sent by the Mediation Server service.
DNS Resolution Failure: %2
 Exception: %3
Cause: The Mediation Server service cannot communicate with the Trunk Service over SIP due to network connectivity issues.
Resolution:
Please ensure network connectivity and availability of the Trunk for the Mediation Server service to be able to function correctly.

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