Symptoms
In a Microsoft Skype for Business Server 2015 environment, when a user uses Skype for Business desktop client to send a file to Skype for Business for iOS app, the app user receives an incoming call from the file sender. This issue occurs after the Skype for Business for iOS app is upgraded to version 6.27.1.
Resolution
To fix this issue, install the August 2021 cumulative update 6.0.9319.619 for Skype for Business Server 2015, Web Components Server.
