Symptoms

When this issue occurs, the Bandwidth Policy Service event ID 36023 is logged on front-end servers every few minutes.

Note When this issue occurs, there is no actual function effect in Skype for Business Server 2015. 

Cause

This issue occurs because the delay in call admission control (CAC) verifications for Inter-Cluster mode is set incorrectly.

Resolution

To fix this issue, install the May 2017 cumulative update 6.0.9319.281 for Skype for Business Server 2015, Bandwidth Policy Service.

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