Symptoms
Consider the following scenario:
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You have a Microsoft Lync Server 2010 environment that has more than one Mediation server and a Public Switched Telephone Network (PSTN) gateway deployed. The Mediation servers are configured to use dual Network Adapters.
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A Mediation server cannot connect to the PSTN gateway because of a network issue that is specific to the Mediation server.
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You call a PSTN number by using Lync 2010.
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The call is routed to the Mediation server.
In this scenario, the Outbound Route application in Lync Server 2010 does not route the calls to a different Mediation server. Additionally, the Mediation server returns the following error message:
SIP/2.0 504 Cannot connect to gateway. Socket error: TimedOut
Resolution
To resolve this issue, install the following cumulative update:
2502810 Description of the cumulative update for Lync Server 2010, Mediation server: April 2011
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
