Not very often but from time to time we have problems during make overseas call or make calls to Mobile phones.
The Lync 2010 and 2013 has a value that is set to 10 seconds before it will terminate the calls.
We can change this value and this can be done by changeing this:
Some of the above timeouts can be configured. The file which has the configurable parameters is 'OutboundRouting.exe.config” Use caution when changing these values, as a rule of thumb try not to increase or decrease the value by more than 25% of its original value.
<add key="FailOverTimeout" value="10000"/>
<add key="MinGwWaitingTime" value="1"/>
<add key="MaxGwWaitingTime" value="20"/>
<add key="FailuresForGatewayDown" value="10"/>
<add key="FailuresForGatewayLessPreferred" value="25"/>
<!-- Valid values are between 5 and 600 -->
<add key="HealthMonitoringInterval" value="300"/>
<!-- Valid values are between 60 and 3600 -->
<add key="GatewayStateReportingInterval" value="1800" />
The FailOverTimeout should be increased to the desired time limit.
The file is found under C:\Program Files\Microsoft\Lync Server 2010/2013\Server\Core
The valuse <add key="FailOverTimeout" value="10000"/> can be changed to 20000 on your frontend server(s) and you have to restart the Lync Frontend Service.
I have also seen issue with Audiocode Mediant 1000 gateways and when trying to make calls to Russia and other countries.
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