Simulcast allows endpoints to send more than one video stream at a time, if more than one resolution is requested for incoming Video Source Requests. HDX RealTime Optimization Pack 2.3 introduced support for Simulcast Video (multiple concurrent video streams). Likewise, native Skype for Business clients running outside of the Citrix XenApp or XenDesktop environment negotiate video quality. Pexip, Cisco) which may also be used in Skype for Business implementations, the Microsoft A-V Conferencing Server does not perform transcoding.ĭuring a video conference call, the HDX RealTime Media Engine on each device negotiates video quality with the Skype for Business A-V Conferencing Server. Unlike MCUs from some other vendors (e.g. The Skype for Business A-V Conferencing Server is a media relay bridge. Most Skype for Business customers use the Microsoft-provided Audio-Video Conferencing Server as their conference bridge (also known as a multipoint control unit ). Simulcast Video versus Lowest Common Denominator Video The video resolutions supported by other participants in a conference call.Policy settings on the Skype for Business server.The network (bandwidth and packet loss).CPU and ability to accelerate H.264 in onboard hardware) The capabilities of the user’s device (e.g.
The key factors affecting video quality in optimized mode are: If there is no HDX RTME on the user device, the solution provides for fallback to server-side media processing and audio-video delivery over ICA using Citrix-developed and supported technologies. In optimized mode, media processing is performed by the HDX RealTime Media Engine (RTME), a Citrix Receiver plug-in that runs on the user device. The joint solution consists of (1) updated versions of the Skype for Business client that include the Media Manager API and (2) the Citrix HDX RealTime Optimization Pack (RTOP) 2.x for Skype for Business. This article provides an overview of the primary factors that affect video quality when using a XenApp-hosted or XenDesktop-hosted Skype for Business client.Ĭitrix and Microsoft co-developed a solution that optimizes the delivery of Skype for Business from XenApp and XenDesktop by redirecting audio-video processing to the user device whenever possible and delivering audio-video traffic out-of-band from the Citrix ICA protocol so that it does not “hairpin” through the XenApp or XenDesktop server.
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