Lync phone calls failes, and log reports/sniff that Lync server cancel it.

When calling some foreign numers Lync server CANCEL the call when it is in progress. Network sniff shows that the call is terminates after 10 sec.


This is a default value of the Lync Routing engine. The value is located in “c:\program files\Microsoft Lync Server 2010\Server\Core\OutboundRouting.exe.config”

SOLUTION:Replace value “FailOverTimeout” value 10000 with a value of 20000. Reboot server. Remember to do this on every frontend server that is involved. You will have to reboot involved servers for this to be activated

      <add key=”FailOverTimeout” value=”20000″/>
      <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″ />

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