In a Microsoft Skype for Business Server 2019 or Skype for Business Server 2015 environment, you use a third-party call center application - Clarity Connect that's UCWA based, and agents sign in to the clarity agent. Because of the following UCWA exception, w3wp.exe crashes and agents sign out. This causes the disconnections from audio calls.
Log Name: Application
Source: .NET Runtime
Event ID: 1026
Task Category: None
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
To fix this issue, install one for the following updates:
The September 2020 cumulative update 7.0.2046.244 for Skype for Business Server 2019 and Unified Communications Managed API 5.0 Runtime.
The July 2019 cumulative update 6.0.9319.559 for Skype for Business Server 2015, Web Components Server.
Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.