For many customers Citrix has Microsoft® Lync® be a widespread "strategic use" excellent audio-video conferencing capabilities and tight integration with the Microsoft Office suite. Fortunately, no other desktop virtualization vendors as comprehensive a set of technologies for Lync as Citrix delivers.
If you want to learn how the HDX features in XenApp, XenDesktop and Citrix Receiver for Lync support users on different device types, this blog post is for you.
We will explore four ways to deliver the Lync client:
- Microsoft® Lync® VDI plug-in
- Local App Access
- HDX realTime Optimization Pack for Lync®
- General HDX realTime
generic and Optimized Delivery Methods
As in my July 2012 post on Softphone explains delivery and the White Paper "Unified Communications with XenApp and XenDesktop: solution Overview", supports Citrix both "generic" and just as we do "optimized" architectures for Unified Communications, for video playback / streaming multimedia. These ensure complementary approaches that virtually any softphone or unified communications (UC) client can be delivered by XenApp or XenDesktop on an ever wider range of devices, while server scalability to maximize.
work Our generic HDX RealTime technologies without any modification or catches in the native client softphone, but as a result of leaving the media processing load on the XenApp / XenDesktop server. The difference with optimized HDX RealTime solutions that are available today for Microsoft Lync, Cisco Jabber, Vidyo and Avaya one-X is that the media processing load is redirected to the user device. These optimized solutions "Media Engine" is running on the endpoint rather than on the server. This is especially valuable in the case of webcam video, the CPU intensive and therefore expensive, when the video processing is done server side.
Citrix supports three optimized solutions for deploying Lync. And our general HDX RealTime technologies offer a valuable fallback for users on devices without Lync-compatible media engine.
Support for Microsoft Lync® VDI plug-in
Microsoft embraced Citrix optimized architecture for UC app delivery with the introduction of Lync 2013 VDI plug-in for Windows. The VDI plug-in is the Lync media engine, wrapped in his own. So the user interface and business logic layers of the Lync client running on the XenApp / XenDesktop server, but the audio-video processing load is shifted to the Windows device user. The server-side Lync client exchanges command and control information with the VDI plug-in via a Dynamic Virtual Channel (DVC). Citrix Receiver supports the tracking log Lync geometry used to position the video content (is running on the server) (reproduced on the endpoint) on the Lync client user interface.
For more details on this solution, see the Citrix support article CTX138408.
Local App Access
The Feature Pack XenApp 6.5 2 and XenDesktop introduced 7.0 Releases Local App Access, sometimes described in the blogosphere as "Seamless Reverse" - a feature Platinum Edition, which makes possible a Windows application locally on the user's device nor do they appear to be integrated with their virtual / published desktop running. Local App Access can be valuable for delivering softphones and UC applications. In the case of Lync VDI plug-in is usually a preferred solution, but Lync by local app can provide access in some scenarios be attractive because certain functional limitations of VDI plug-in, such as lack of support for Lync Online winds (Office 365 hosted Lync) and (view multiple video) gallery view. A disadvantage is that the application sharing is not possible because the Lync client is not running on the same computer as other user applications (they are running XenApp / XenDesktop server). Screen sharing, but works well. Integration with Outlook can be a challenge because some functions to reside need the Lync and Outlook clients co. These problems can be alleviated with some tricks configuration.
HDX RealTime Optimization Pack for Lync
If your users containing a substantial population of Linux or Mac user, then you should seriously consider using the HDX RealTime Optimization Pack for Lync. Version 1.5 was released last month in conjunction with XenApp and XenDesktop 7.6. 
There can be used later with XenApp 6 and XenDesktop 5 and. This solution is compatible with Lync Server 2013 and Lync Server 2010, to deliver on Windows, Linux and Mac users during the Lync 2010 client. Citrix policy prevents me to comment on our specific timetable plans, but I can assure you that we continue to improve this solution because of the tremendous value it brings with non-Windows devices to the customers.
documentation for HDX RealTime Optimization Pack for Lync is under on eDocs: http://support.citrix.com/proddocs/topic/technologies/hdx-realtime-optimization-pack-wrapper.html
The HDX RealTime Optimization Pack for Lync Lync uses APIs and licensed by Citrix codecs from Microsoft. Additionally, it includes a variety of industry-standard audio and video codecs to enable interoperability with third-party products, to register with the Lync Server, as in the room videoconferencing systems.
General HDX RealTime Technologies
There is not lost if you are on a device without Lync-compatible media engine. Citrix supports XenApp / XenDesktop server the full Lync client is running and to deliver the audio-video content through our ICA protocol. A variety of generic HDX RealTime technologies make this feasible, such as:
- Optimized for speech codec with encode faster time audio latency
- UDP / RTP minimize audio transmission to minimize audio latency of congested and lossy network connections
- Packet Tagging for QoS (both DSCP for RTP packets at layer tagging 3 and also for WiFi WMM-tagging)
- jitter buffering
- webcam video compression (including H.264)
While Citrix policy does not allow me on our roadmap to be concrete plans, I can confirm that we invest Realtime technologies in general HDX continues in both our HDX and our receivers teams.
Support Forums
have any technical questions about our HDX RealTime technologies or to see leadership from the Citrix community to take advantage visit our support forums.
Asked Questions
Q Common: When will the HDX RealTime Optimization Pack for Lync support delivery of the Lync 2013 client
roadmap information can not be shared in a public forum like this blog. , Within the limits of Citrix policies, Citrix sales representative can for a roadmap discussions at a Non-Disclosure Agreement
[ January can arrange 2015 Update: A new version of the HDX realTime Optimization Pack for Lync is planned for this quarter (March availability). This version is optimized for Linux and Windows devices with Mac support to follow delivery of the Lync 2013 client in Q2]
. Q: Can XenApp / XenDesktop with Lync Online (Office used 365 hosted Lync)?
Yes. Although I can not express plans on our roadmap, let me summarize as Lync Online is currently supported by our HDX technologies.
Obviously since Local App Access and the general HDX RealTime technologies deliver native Lync client, these approaches both support Lync Online. is Microsoft Lync 2013 VDI Plugin currently not Lync Online / Office 365, but the HDX RealTime Optimization Pack for Lync support in these two scenarios:
- Customer synchronized password hashes between their local Active Directory and Office 365 with Microsoft Azure Active Directory Sync tool
- user accounts ( "Cloud identities") are in the Microsoft Azure Cloud (typical of SMB implementations) held
Since Office 365 is a web service only TLS-DSK for authentication support
[ update December 2014 :. 365 [1945020fürLyncHDXRealtimeOptimizationPack-Version16des] supports AD Federation to Lync Online / office. See /blogs/2015/01/05/using-xenappxendesktop-with-lync-online/.]
Q: Can I have a mix of delivery methods use different user groups or device types to address?
Yes, it is often useful to users needs to use a combination of Lync delivery methods based and the strengths and weaknesses of each of the four approaches to this blog entry summarized. This can have several virtual desktop images require the creation of
. Q. What authentication methods with the latest version 1.5 supports HDX RealTime Optimization Pack for Lync
Citrix support article CTX135647 checks the authentication process for HDX RealTime Optimization Pack for Lync. The Optimization Pack the following Lync authentication methods supported:
- TLS DSK certificate-based authentication (preferably)
- NTLM (relapse)
Kerberos is supported only by the Optimization Pack for authentication to Lync Web Services server.
Passwords can "save password" in the Windows Credential Manager or with the option to be saved (depending on admin control) in the native Lync registry or the Optimization Pack registration. The Optimization Pack uses the Microsoft Windows Data Protection API that encrypts the password so reversible that it can not be decrypted on another computer. The stored password can be used:
- to retrieve the Web-ticket and the certificate, if a certificate is not available to the user in the Optimization Pack Registry
- authenticate using NTLM when TLS-DSK authentication
Although Lync no smart cards directly support TLS certificate DSK Login enables lack the use of certain smart cards. The optimization package can obtain a certificate for the user and will be stored in the registry. , If the Lync client is hosted on XenApp, it can: For example, in the Nordic countries, the widespread SecMaker Net iD Smart Card has been used successfully with the HDX RealTime Optimization Pack for Lync
Q as seamless published application are delivered, and not published in a full desktop?
Yes, unless the Microsoft Lync VDI Plugin. The Lync 2013 or Lync 2010 client can be delivered as a published app, when the full Lync client is hosted on XenApp and come with generic HDX RealTime (server-side media processing). And the Lync 2010 client can also be supplied as a published application on the HDX RealTime Optimization Pack for Lync
. Q: Are there solutions from Microsoft Support Citrix to deliver for the Lync client?
Citrix Receiver, XenApp and XenDesktop use developed and supported by Microsoft APIs and other components. Usually - as with any application Citrix - customers should first contact Citrix Support. If necessary, Citrix will work with Microsoft when an error in Microsoft components is discovered
[ Update January 2015 :. See article CTX 132979 for further details of the technical support of Microsoft Lync in a Citrix environment]
. Q: Who can help design and roll-out our XenApp / XenDesktop plan users of Lync voice and video?
Citrix Consulting to design available with your Citrix Partner and Microsoft are working and plan your Lync rollout.
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