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The Optimization Pack supports “subscription-based video mode” (default since the 2.1 release), where the HDX RealTime Media Engine informs the Audio-Video Conferencing Server which video stream to send to it based on both automatic speaker tracking and user choice, and “active speaker only mode”. Gallery View, where the video for up to five speakers can be seen (plus pictures of other participants), will not be supported. Nevertheless, there are a few UI differences when the Skype for Business client is virtualized. In the v2 architecture, the Skype for Business client user interface (UI) is owned solely by Microsoft and not altered by Citrix software. (This article also applies to the previous 2.3 release and 2.5 or higher.) . This article summarizes the salient variances of this solution from non-virtualized Skype for Business as of 2019 2.4 Long Term Service Release of the Optimization Pack.
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Version 2.x of the HDX RealTime Optimization Pack provides a native Skype for Business client UI experience with very few differences in feature set compared to running the Skype for Business client locally on a Windows device, while maximizing server scalability through redirection of media processing to the user device. This is the only Microsoft-endorsed field-proven solution for delivering Skype for Business in a virtualized environment, supporting not just two-way point-to-point calls but also conference calls and Skype Meetings. The primary recommended method for delivering the Microsoft Skype for Business® client from Citrix Virtual Apps and Desktops (formerly known as XenApp and XenDesktop) is HDX RealTime Optimization Pack 2.x, the product of a close collaboration between Citrix and Microsoft to co-develop a new and improved "v2" delivery architecture for Skype for Business and Citrix customers.
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