For access to this version of the RealTime Optimization Pack features, upgrade your Skype for Business 2015 to the June 2016 PU (15.0.4833.1001) or subsequent PU or your Optimization Pack 1.x to this version.
Optimization Pack supports flexible upgrade from earlier 2.x Optimization Pack versions to this version. To upgrade from previous Optimization Pack 2.x versions to this version, be aware of the following considerations:
If you are upgrading from 1.x, you must upgrade both RealTime Connector and RealTime Media Engine to retain optimized operation.
If you are running the 32-bit Citrix Receiver for Linux and 32-bit RealTime Media Engine on 64-bit systems, you can use the 32-bit RealTime Media Engine package to upgrade.
If you want a 64-bit RealTime Media Engine, first uninstall both 32-bit Citrix Receiver for Linux and 32-bit RealTime Media Engine. Then install the 64-bit Citrix Receiver for Linux, version 13.2 or later and 64-bit RealTime Media Engine
During 2015, Citrix and Microsoft co-developed a new architecture for delivering Skype for Business in virtualized environments. This new architecture provides smooth upgrades from one 2.x release to the next. It does so by allowing customers to upgrade the RealTime Connector on the XenApp and XenDesktop servers before upgrading the RealTime Media Engine on all user devices. But upgrading from the original 1.x to 2.x is more challenging because 1.x versions of the RealTime Media Engine aren't compatible with the RealTime Connector 2.x. Therefore, during the interval between upgrading the RealTime Connector and upgrading the RealTime Media Engine on user devices, optimized delivery of the Skype for Business client isn't possible.
For the smoothest possible upgrade, we recommend using Electronic Software Delivery mechanisms to update the RealTime Connector and the RealTime Media Engine on user devices. Execute the upgrades as close to simultaneously as possible. To manage server load if some users require Skype for Business audio-video services while a major version mismatch exists between RealTime Connector and RealTime Media Engine, the RealTime Connector provides fallback controls (introduced in the 2.1 release). These controls enable administrators to configure whether to deny audio-video service totally until the RealTime Media Engine is upgraded to 2.x, permit only audio, or permit both audio and video. Server-side video processing has the greatest impact on CPU usage and server scalability.
Citrix and Microsoft collaborated on a "version 2" architecture for delivering the Skype for Business client from XenApp and XenDesktop. This collaboration culminated in the HDX RealTime Optimization Pack 2.0 release in December 2015 and a corresponding update to the Skype for Business client. Previously, Microsoft promoted a "version 1" solution consisting of a Citrix Receiver for Windows plug-in called the VDI plug-in.
The Lync 2013 client version 15.0.4859.1002 (released in September 2016) includes an enhancement to support co-residency of the Lync VDI plug-in with HDX RealTime Media Engine 2.2. This enhancement assists migration. The migration procedure: