When this issue occurs, the following Warning event is logged on front-end servers every few minutes:Note
When this issue occurs, there is no actual function effect in Lync Server 2013.
CAC represents the call admission control feature.
This issue occurs because the delay in call admission control verifications for Inter-Cluster mode is set incorrectly.
To resolve this issue, get the November 2014 Cumulative Update 5.0.8308.834 for Lync Server 2013 Bandwidth Policy Service.