Product Documentation

About this release

Feb 04, 2016

 Citrix supports two primary alternative methods for optimized delivery of the Microsoft Skype for Business or Lync client from XenApp and XenDesktop:

  • Full support for Microsoft’s VDI Plug-in (media engine) for Skype for Business 2015 or Lync 2013 with the Citrix Receiver for Windows.
  • Citrix HDX RealTime Optimization Pack.

Citrix recommends the Microsoft VDI Plug-in for customers using Skype for Business exclusively with Windows devices (Windows 7, Windows Embedded Standard 7, and Windows 8) and delivering the Skype for Business or Lync client as part of a full virtual desktop. This solution is qualified by Microsoft for XenDesktop 7.1 and above and Citrix Receiver 4.1.02 and above. For information about this solution, see and

Citrix HDX RealTime Optimization Pack provides a highly scalable solution for delivering real-time audio-video conferencing and VoIP enterprise telephony through Microsoft Skype for Business or Lync in XenDesktop and XenApp environments to users on Linux, Mac, and Windows devices. HDX RealTime Optimization Pack leverages your existing Microsoft Skype for Business or Lync infrastructure and inter-operates with other Microsoft Skype for Business or Lync endpoints running natively on devices.

HDX RealTime Optimization Pack consists of both client and server components:

  • The client component, called Citrix HDX RealTime Media Engine, integrates with Citrix Receiver on the endpoint device and performs all signaling and media processing directly on the user device itself, offloading the server for maximum scalability, minimizing network bandwidth consumption and ensuring optimal audio-video quality.
  • The server-side (and virtual desktop) component, Citrix HDX RealTime Connector, is a connector to the Microsoft Skype for Business or Lync client that drives the RealTime Media Engine on the endpoint. RealTime Connector runs in the virtual server environment alongside Microsoft Skype for Business or Lync and communicates signaling information over a Citrix ICA virtual channel to the RealTime Media Engine running on the user device.

What's New

  • Skype for Business - Support for Microsoft Skype for Business server 2015 and the Skype for Business client in Lync UI mode.
    Note: Skype for Business client must be in Lync UI mode. For information about putting Skype for Business client into Lync UI mode, see
  • Consolidated client support - Optimized delivery of the Microsoft Skype for Business 2015 client, Microsoft Lync 2013 client, and the Microsoft Lync 2010 client.
  • Call Park, Call Pick Up, Call forwarding, and simultaneous ringing controls  in Lync 2010 client. Users can:
    • Transfer active calls to the parking lot and then pick them up.
    • Send the access address (orbit) to other Lync users allowing them to retrieve the call.
    • Set up call forwarding and simultaneous ring to keep calls from being missed.
    • Forward incoming calls by setting up forwarding rules.
    • Set up simultaneous rings of incoming calls to ring their phones and another number
  • Mac support:
    • RealTime Media Engine for Mac - RealTime Media Engine for Mac works with Skype for Business Server 2015, Lync Server 2010, 2013, and Office 365 and the HDX RealTime Connector for Skype for Business 2015, Lync 2010, and 2013.
    • Macintosh FaceTime camera -  RealTime Media Engine and RealTime Connector can send video captured with a FaceTime camera.
    • Lync-certified audio devices on Mac – This includes all Lync-certified devices.
  • Kerberos authentication – Kerberos authentication support for domain-joined devices.
  • Separate port ranges – RealTime Media supports provisioning of separate port ranges for audio and video.
  • Support for technical preview of Microsoft Windows 10- Support for the technical preview of Windows 10 virtual desktops and user device