Making a video call from a virtual desktop can be tricky. When the call is initiated in the virtual desktop, the user’s microphone and camera send the user’s voice and image to the virtual desktop. VMware Horizon® sends that data compressed, using our real-time audio-video (RTAV) feature. But the RTAV feature still sends a lot of data across the wire, and the virtual desktop has to process the data and send it out over the network to complete the call. At the same time, the virtual desktop is capturing the video feed and sending it back over the network, using the VMware Blast display protocol, to the endpoint so that the end user can see the video feed. Show
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VMware, working closely with Microsoft, supports Media Optimization for Microsoft Teams with Horizon 8 (2006 and later) and Horizon 7 version 7.13. With the supported Horizon Agent and VMware Horizon® Client versions, when a user starts a call inside the virtual desktop, a channel to the local physical device is opened and the call is started there. Horizon Client draws over the Microsoft Teams window in the virtual desktop VM, giving users the impression that they are still in the VM, but the media is actually traveling directly between the local endpoint and the remote peer (as shown in Figure 1). The load disappears from the network, and the processing moves from the data center to the endpoint. Often the end-user experience improves as well because the data has one less hop to make. Using this mechanism, this process avoids using RTAV altogether. The Media Optimization for Microsoft Teams feature is a boon for organizations using Microsoft Teams for audio and video calls. This document helps you plan for deploying it. The following diagram describes the flow of data between the various components of the Microsoft Teams optimization feature in Horizon.  Figure 1: Microsoft Teams Optimization Flow Horizon supports audio, video, and screen-sharing offload to the local endpoint on Windows, Mac, and Linux platforms. Below is a list of the minimum supported versions for each platform. For a complete list of features supported on each platform, see the product documentation topic for the version of Horizon that you are using.
Note: For Horizon documentation references, we will be using Horizon 8 (2106) product documentation links throughout this guide. VMware supports Media Optimization for Microsoft Teams as part of Horizon 8 (2006 and later) and Horizon 7 version 7.13 and later. The Media Optimization for Microsoft Teams feature is also available with Horizon Cloud on Microsoft Azure, Pod Manifest version 2298.X and later. Microsoft also turned on the service on their side on August 11, 2020. To take advantage of the offload capability, you must use Horizon Client for Windows 2006 or later, Horizon Client for Mac 2103 or later, or Horizon Client for Linux 2106 or later. The Media Optimization for Microsoft Teams group policy setting must be enabled in the virtual desktop. Note: The Microsoft Teams web app (browser client) is not supported via the Teams Optimization Pack. Web browser media offload is supported with the Browser Redirection feature. See Configuring Browser Redirection for support details. System RequirementsThis section briefly lists the system requirements for both the client and the virtual desktop when using the Media Optimization for Microsoft Teams feature. For more details, see Configuring Media Optimization for Microsoft Teams (for Horizon 8) or Configuring Media Optimization for Microsoft Teams (for Horizon 7.13). Note: System requirements for RTAV are different and more substantial than those for Media Optimization for Microsoft Teams. RTAV is used if Media Optimization is not turned on via GPO or if the endpoint does not support Media Optimization (fallback mode). For more information about using Microsoft Teams with RTAV, see the Horizon documentation for the appropriate version: Configuring Microsoft Teams with Real-Time Audio-Video and System Requirements for Real-Time Audio-Video. Client system (for OSes supported with a specific release, see the appropriate Horizon Client release notes)
Virtual desktop system
Client InstallationIn Horizon Client for Windows, the Media Optimization for Microsoft Teams feature is installed by default. You can see the setting if you select Customize installation in the installer.
Figure 2: Microsoft Teams Optimization Feature in the Horizon Client for Windows Installation Wizard In Horizon Client for Mac, Media Optimization for Microsoft Teams is installed by default. Double-click the .dmg file to open it, and drag the VMware Horizon Client icon to the Applications folder.
Figure 3: Microsoft Teams Optimization Feature in the Horizon Client for Mac In Horizon Client for Linux, Media Optimization for Microsoft Teams is also installed by default. If you are using the installation wizard, you can see that the Media Optimization for Microsoft Teams option is selected, as shown below. Figure 4: Microsoft Teams Optimization Feature in the Horizon Client for Linux Installation Wizard Horizon Agent Installation and ConfigurationMedia Optimization for Microsoft Teams is also installed by default in the Horizon Agent, but it is controlled with a GPO, which is not enabled by default. The GPO can be enabled using the Group Policy Editor. Navigate to Computer Configuration > Administrative Templates > VMware View Agent Configuration > VMware HTML5 Features > VMware WebRTC Redirection Features > Enable Media Optimization for Microsoft Teams.
Figure 5: Path in the Group Policy Editor for Enabling the Microsoft Teams Optimization Feature Double-click to open and enable the policy.
Figure 6: Group Policy Setting for Enabling the Microsoft Teams Optimization Feature After setting this policy, you must log out of the Horizon desktop for the GPO policy to take effect. Important: The order of installation of Horizon Agent and Microsoft Teams is important. Horizon Agent must be installed before Microsoft Teams. If the order is reversed, then on first run, Microsoft Teams does not detect Horizon Agent and caches an environment value that indicates the feature is running on an unsupported remote desktop. This results in Microsoft Teams never supporting the Media Optimization feature unless the cache is deleted. To avoid this issue, be sure to install Horizon Agent before you install Microsoft Teams. Then, on first run, Microsoft Teams detects Horizon Agent and caches the correct environment value, which verifies that the feature is running on a supported remote desktop. Microsoft Teams InstallationAfter Horizon Agent is successfully installed, install Microsoft Teams on the Horizon Agent machine. Follow the instructions provided on the Microsoft website, at https://docs.microsoft.com/en-us/microsoftteams/teams-for-vdi. Pairing ModesAs described in the overview of this guide, there are significant advantages to running Microsoft Teams in optimized mode. However, as you are planning your implementation, keep in mind that end users who are not running supported Horizon Client versions (Horizon Client 2006 or later for Windows, Horizon Client 2103 or later for Mac, or Horizon Client 2106 or later for Linux) will not be able to take advantage of this feature. They will not, however, go back to running the full client in the virtual desktop because the GPO has set Microsoft Teams to offload audio and video to the client. Those users will instead run in fallback mode. Fallback mode has all the functional limitations of WebRTC (Web Real-Time Communication) but is still pushing all the data to the virtual desktop over RTAV. A user can check if Microsoft Teams is running in optimized mode, fallback mode, or natively (no optimization) in the virtual desktop. In the top-right corner of the Microsoft Teams interface, click the three dots near the user icon and navigate to About > Version to see a banner under the user icon describing the Microsoft Teams version and pairing modes:
Before you decide to turn on the GPO for Microsoft Teams optimization, consider the following:
When deploying this feature, also take the following guidelines into account. Supported Horizon Client for Windows VersionsFor beta testing, VMware built support for Microsoft Teams into the Horizon Client for Windows versions 5.3, 5.4, 5.4.1, 5.4.2, and 5.4.3. If you enable the optimization GPO in the virtual desktop, these clients, although not officially supported, will begin implementing offload. The bugs we found in these clients during beta testing are fixed in Horizon Client for Windows version 2006 or later (for Horizon 8) or Horizon Client for Windows 5.5 or later (for Horizon 7.13 or later), which is officially supported. VMware strongly recommends using the officially supported versions. Supported Horizon Client for Mac and Linux VersionsFor beta testing, VMware published the Horizon Client 2012 beta installer for Mac (via the beta portal) that supports optimization. VMware recommends that you use the officially supported version, Horizon Client 2103 or later for Mac, to get the latest functionality and bug fixes for the Mac client. Similarly, VMware published a beta version of Horizon Client 2103 for Linux that supports optimization (via the beta portal). VMware recommends using the officially supported version, Horizon Client 2106 or later for Linux, to get the latest functionality and bug fixes for the Linux client. Note: Screen sharing when Microsoft Teams is published as an application is not supported on Linux or Mac clients as of Horizon Client 2016 for Mac or Linux. Network Ports and FirewallsMicrosoft Teams requires that the following ports be open on the client side: TCP ports 80 and 443, and UDP ports 3478 through 3481. For more information, see the Microsoft Teams documentation topic Prepare your organization’s network for Microsoft Teams. The ports described on that page are required to be opened on the client device. Note: The usual Horizon ports are also required, as detailed in the following documents: Some organizations might require that the process name of the Teams Optimization Pack be added to a firewall allowlist, to allow communication to the Microsoft Teams Cloud server. The process name is vmware-remotemks.exe on the client machine. Incompatibility with Citrix AgentFor Media Optimization for Microsoft Teams to work properly, Citrix Agent should not be installed. This is a Microsoft restriction. See the section Action 5: Check for a Conflicting Agent Installation of this guide for more details. Optional Configuration Settings for Issues with EchoIn certain low-powered clients, users may want to turn off software acoustic echo cancellation to reduce CPU usage. In most cases, VMware recommends using the default configuration, which is designed for optimal audio experience. But if you are having issues with echo, software acoustic echo cancellation can be configured by using a GPO on the Horizon Agent or by setting a registry key on the Horizon Client. Note that this configuration is only supported on Windows Clients. Turning on this GPO will have no effect on Linux and Mac clients. On Horizon Agent, the GPO can be enabled by navigating to Computer Configuration > Administrative Templates > VMware View Agent Configuration > VMware HTML5 Features > VMware WebRTC Redirection Features > Enable software acoustic echo cancellation for Media Optimization for Microsoft Teams. After setting this policy, you must log out of the Horizon desktop for the GPO policies to take effect.
Figure 7: Path in the Group Policy Editor for Configuring Software Acoustic Echo Cancellation
Figure 8: Group Policy Setting for Configuring Software Acoustic Echo Cancellation This configuration can also be applied on the Horizon Client for Windows device by setting the following registry key: HKEY_CURRENT_USER\SOFTWARE\VMware, Inc.\VMware Html5mmr\WebrtcRedir Use one of the following settings:
To troubleshoot, start by checking whether Microsoft Teams launched in optimized mode and whether the correct local client device names are being picked up. If so, you can check whether the Microsoft Teams redirection plugin has been installed and check the logs to verify that optimization has been enabled. Procedures for these tasks are described in the following sections: Step 1: Check If Microsoft Teams Launched in Optimized ModeIn Microsoft Teams, click the ellipsis points (…) next to your profile picture at the top, and select About > Version. This shows you a banner at the top of the app that will say, “VMware Media Optimized,” indicating that Microsoft Teams has launched in optimized mode.
Figure 9: Version Box for Microsoft Teams If you see “VMware Media Optimized” in the banner, proceed to Step 2: Check If the Microsoft Teams Device Settings Show the Local Device Names from the Client. If you do not see “VMware Media Optimized” in the banner, follow the below action items. Action 1: Check If the VM Agent Registry Key Is Set CorrectlyLaunch the Registry Editor inside the VDI desktop by pressing (Windows key)+R and then type regedit.
Figure 10: Registry Key for the Horizon Agent Installation Path If the registry key is not set, contact VMware for further assistance. If the registry key is correctly set, continue to the next action item. Action 2: Check If the GPO Is Set CorrectlyLaunch Registry Editor inside the VDI desktop. Check if “HKEY_LOCAL_MACHINE\SOFTWARE\Policies\VMware, Inc.\VMware WebRTCRedir” teamsEnabled (REG_DWORD) is set to 1.
Figure 11: Registry Key for Enabling Microsoft Teams Optimization If the registry key is not set, follow the installation guidance for Horizon Agent, as described in Horizon Agent Installation and Configuration. Also note that you need to log out of the Horizon desktop for the GPO policies to be applied. If the registry key is correctly set and you do not see “VMware Media Optimized” in the banner, follow the next action item. Action 3: Restart the Microsoft Teams ApplicationIn the virtual desktop, restart Microsoft Teams to ensure that the correct settings have been applied by the Microsoft Teams client. We have seen issues in Microsoft Teams where incorrect flags get applied. Restarting Teams ensures that the correct flags are pulled in and applied. If you see “VMware Media Optimized” in the banner after restarting Microsoft Teams, proceed to Step 2: Check If the Microsoft Teams Device Settings Show the Local Device Names from the Client. If you do not see “VMware Media Optimized” in the banner even after restarting Microsoft Teams, follow the next action item. Action 4: Delete the Microsoft Teams Folder and RestartQuit the Microsoft Teams application. Open File Explorer, and delete the folder %APPDATA%\Microsoft\Teams and then restart Microsoft Teams. This will force Microsoft Teams to reload its cache, which may have contained outdated values related to the environment. If you see “VMware Media Optimized” in the banner after restart, proceed to Step 2: Check If the Microsoft Teams Device Settings Show the Local Device Names from the Client. If you do not see “VMware Media Optimized” in the banner after restarting Microsoft Teams, follow the next action item. Action 5: Check for a Conflicting Agent InstallationTo ensure that Microsoft is not detecting a conflicting Citrix Agent installation on the desktop, review the Microsoft logs. Instructions for collecting Microsoft logs are provided in the Microsoft documentation topic Use log files to monitor and troubleshoot Microsoft Teams.
If you see “VMware Media Optimized” in the banner after reinstalling Teams, proceed to Step 2: Check If the Microsoft Teams Device Settings Show the Local Device Names from the Client. If you do not see “VMware Media Optimized” in the banner after performing the above action items, contact Microsoft for further assistance. Step 2: Check If the Microsoft Teams Device Settings Show the Local Device Names from the ClientIn Microsoft Teams, click the ellipsis points (…) next to your profile picture at the top, and then select Settings and go to the Devices section. Under Audio devices, you should see the local headset names in the Speakers and Microphone drop-down lists. You should not see “Virtual DevTap” or “VDI” in the label.
Figure 12: Device Settings for Microsoft Teams If you see the local device names in the Microsoft Teams device settings, then Microsoft Teams optimization has been enabled in your environment. If you do not see the local device names and, instead, you see “Virtual DevTap” or “VDI” in the device list, follow the below action items. Action 1: Check If html5Server Is RunningIn an active Horizon session to the Horizon Agent VM, start the Task Manager window in the virtual desktop. Check if html5Server.exe is listed on the Details tab of the Task Manager.
Figure 13: Task Manager Showing That html5Server.exe Is Running If you do not see html5server.exe listed in the Task Manager, restart the VM and try again. If you still do not see html5server.exe running after the restart, contact VMware for further assistance. If you see that html5server.exe is running in the VM, then follow the next action item. Action 2: Check the Proxy Bypass List If Using a Proxy on the Remote DesktopIf you have an Internet proxy configured on your remote desktop, you will need to add “view-localhost” in the proxy bypass list. Similarly, if you are using a .pac file, the .pac file should allow direct access to “view-localhost” and bypass the proxy. Otherwise, html5server will not work as expected. Because html5server.exe also uses secure web sockets (wss protocol) to communicate with Microsoft Teams, ensure that your .pac file allows “wss://” traffic. If you did not configure a proxy on your remote desktop or have included “view-localhost” in the bypass list, follow the next action item. Action 3: Exclude the HTML5Server Registry Key from User Profile Management SoftwareIf you use a user profile management software such as VMware Dynamic Environment Manager™ or FSLogix, ensure that you have excluded the below registry key from profile management. This is an internal registry key used by html5Server.exe. Backing up and restoring the registry key may result in erroneous behavior. HKEY_CURRENT_USER\Software\VMware, Inc.\HTML5 Redirection Server If you do not have any user profile management software installed or have excluded the above-mentioned registry key from the list, follow the next action item. Action 4: Check the html5Server Logs in the Virtual DesktopImportant: For the following step, you need to have administrator privileges on your virtual desktop operating system. On your VM, open File Explorer, and navigate to C:\Windows\TEMP\vmware-SYSTEM. Look for the log file vmware-html5Server-extra-*-*.log with the latest timestamp. If you see the below highlighted section, then Microsoft Teams optimization has been enabled on your VM.
Figure 14: The Most Recent html5Server Log Displaying “allow”:”true” Note: For your convenience, the highlighted text you can search for includes the following settings: "command":"createInstanceDone" If the above settings are missing from the logs or if the logs display "allow:false" then Microsoft Teams optimization has not been enabled in your environment. Proceed to Step 3: Check If the Microsoft Teams Redirection Plugin Is Present on Horizon Client. Step 3: Check If the Microsoft Teams Redirection Plugin Is Present on Horizon ClientOn a Windows client, open File Explorer, navigate to C:\Program Files (x86)\VMware\VMware Horizon View Client\x64, and verify that webrtc_sharedlib.dll is present.
Figure 15: Microsoft Teams Optimization Plugin DLL on the Windows Client On a Linux Client, check that libwebrtc_sharedlib.so is present in the “/usr/lib/vmware/view/vdpService/webrtcRedir” folder and it has the correct permissions.
Figure 16: Microsoft Teams Optimization Plugin Library on the Linux Client On a Mac client, open the Finder and check that libwebrtc_sharedlib.dylib is present under the “/Applications/VMware Horizon Client With Teams Optimization.app/Contents/Library/pcoip/vchan_plugins/vdpservice” folder. Figure 17: Microsoft Teams Optimization Plugin Library on the Mac Client If the webrtc_sharedlib library is present on your client, proceed to Step 4: Check If the Html5Client Log Shows Optimization Is Enabled. If the webrtc_sharedlib library is missing on your client, follow the below action item. Action: Install Horizon Client with Microsoft TeamsGo through the installation guidance for Horizon Client for Windows or Linux, as described in Client Installation, and ensure that Media Optimization for Microsoft Teams check box has been selected in the Horizon Client Installation wizard. If the webrtc_sharedlib library is still missing on your client, contact VMware for further assistance. For the Mac platform, ensure that you have the supported version of Horizon Client installed. If you have the supported versions installed and have selected the right configuration for Media Optimization for Microsoft Teams, contact VMware support. Step 4: Check If the Html5Client Log Shows Optimization Is EnabledOn a Windows client, open File Explorer and navigate to the folder %TEMP%\vmware-<username>. Look for the log file vmware-html5Client-*.log with the latest timestamp. On a Linux client, the log file can be found under /tmp/vmware-<username>. On a Mac client, the log file can be found under ~/Library/Logs/VMware. If you see the below highlighted section in the logs, then Microsoft Teams optimization has been correctly enabled for your session.
Figure 18: The Most Recent html5Client Log Displaying “allow”:”true” Note: For your convenience, the highlighted text you can search for includes the following settings: "command":"createInstanceDone" If the above settings are missing from the logs or if the logs display "allow":"false" then Microsoft Teams optimization has not been enabled in your environment. Contact VMware for further assistance. Troubleshooting by Comparing with the Microsoft Teams Web AppIf Microsoft Teams on VDI is optimized and you are running into generic issues, or if you find that features are missing, check if you see the same behavior when using the Microsoft Teams web client. The Media Optimization for Microsoft Teams solution on VDI is based on the Microsoft Teams web client, which leverages WebRTC technology. If you see the same behavior on the web client, or if you find that a feature is missing, contact Microsoft for further assistance. This section describes how to collect logs from the virtual desktop, the client device, and the Microsoft Teams app. Collecting VMware LogsCollect VMware logs from the remote desktop and the client machine by following the instructions in the VMware Knowledge Base article Collecting VMware Horizon View (vdm) log bundles (1017939). Collecting Microsoft Teams LogsCollect Microsoft Teams logs by clicking on the Microsoft Teams application inside the desktop, and using the keyboard shortcut Ctrl+Alt+Shift+1. For more information, refer to https://docs.microsoft.com/en-us/microsoftteams/log-files. The improved end-user experience, decreased load on the data center, and decrease in network traffic make Media Optimization for Microsoft Teams a compelling feature. A thoughtful rollout plan will keep users productive. Additional ResourcesSee the Microsoft Documentation for details about Microsoft Teams installation, performance considerations, and feature limitations. See the VMware Horizon Documentation for details about supported features and limitations. See the Microsoft Live Events and Meetings documentation for a list of meetings and live events sub-features supported in VDI. ChangelogThe following updates were made to this guide.
Kristina De Nike is a Product Line Manager, EUC Virtual Workspace, VMware. Sonia Prabhu is an R&D Manager, EUC Virtual Workspace, VMware. The following VMware staff contributed to this document:
To comment on this paper, contact VMware End-User-Computing Technical Marketing at . |
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