I have noticed some trouble due to timeout when calling abroad.
What I have done that fixed this problem was:
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\Server\Core
Change this from 10000 to 20000 (20 sec). Save the file and reboot the frontend server.
<add key="FailOverTimeout" value="20000"/>
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