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Core FAQ

Warning: Anywhere365 customers and partners deploying or considering deploying recent Skype for Business Server 2015 Cumulative Updates or have Skype for Business Server 2019. Microsoft has acknowledged that the recent Skype for Business Server 2015 Cumulative Update (CU8 and CU9) has introduced an undesired anomaly in the SfB Conferencing Server service. The anomaly can lead to a deadlock when 2 incoming calls are routed simultaneously to two different queues using UCMA Microsoft Unified Communications Managed API (UCMA) is used primarily to build middle-tier applications that work with the Skype for Business Server. and each call is then transferred to the other queue. The anomaly will cause UCMA to deadlock in the AVMCU Service, causing AVMCU to stop processing all other incoming request and wait (perpetually) for the deadlock to be resolved.

Resolved: Microsoft has a fix in CU10. We strongly recommend not to install CU8 and CU9

For more information visit this Microsoft Support page

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