Get-CsService -ConferencingServer | Select-Object Identity, AudioPortStart,ĪudioPortCount, VideoPortStart, VideoPortCount, AppSharingPortStart, You can verify the existing port ranges for your Conferencing, Application, and Mediation servers by running PowerShell commands. You must use PowerShell to configure port ranges. If you do not, QoS will not work as expected.) (For example, if you use ports 57501 through 65535 for video on your Conferencing servers, then you must also reserve ports 57501 through 65535 for video on your application servers. These port ranges must not overlap in any ways. Configure the port ranges for conferencing and peer-to-peer media traffic:įor QoS to work correctly, configure identical port ranges for audio, video, file transfer, and app sharing on your Conferencing, Application, and Mediation servers.In case you want to enable QoS site wide, run the following commandlet: Set-CsMediaConfiguration -Identity Site: -EnableQoS $True Set-CsMediaConfiguration -EnableQoS $True To Enable QoS globally, run the following PowerShell command: You can run the Get-CsMediaConfiguration command from PowerShell to see if "EnableQoS" shows "True" or "False". QoS is not enabled by default on Skype for Business/Lync servers. Enable QoS for all clients, which are disabled by default:.QoS is not applicable for traffic routed over the Internet. This QoS capability is only applicable to Skype for Business clients and IP phone devices which are registered directly to an internal Skype for Business or Lync pool Server on managed networks.
Skype for Business clients for iOS Version 6.17 and later now support QoS. Listed in the table below are the port ranges and DSCP values associated with their media type: Media Type Lync 2013, Skype for Business 2015, and Skype for Business 2016 – lync.exe.Lync 2010 and Lync Attendant Console – attendantconsole.exe.Office Communicator 2007/R2 and Lync 2010 – communicator.exe.
In other words, the Windows or Windows Server operating system can identify the traffic type and apply the appropriate DSCP to each packet according to the port that it uses.īelow is the client application with its executable file name: This means that all client apps, which utilize the audio, video, and app sharing file transfer ports that are configured for audio, video, app sharing, or file transfer will get DSCP markings stamped. Operating systems such as Windows 10, Windows 8, Windows 8.1, Windows 7, or Windows Vista utilize the policy-based QoS, which has the benefit of restricting the QoS at the application level.
When the client initiates media traffic using applications like lync.exe, communicator.exe, or attendeeconsole.exe, all applications that utilize the audio/video, app sharing, or file transfer ports will get Differentiated Services Code Point (DSCP) markings stamped by the operating system via Group Policy Object (GPO). This means that once your Skype for Business/Lync client signs in, they will start using these locked down port ranges, which are configured on a Skype for Business/Lync Server and pushed down to Skype for Business/ Lync clients. ☺ How does QoS work?īasically, all port ranges are provided to the Skype for Business/Lync client via in-band provisioning. This is an 元 WAN built by a service provider to sell its bandwidth to multiple customers and allows QoS to be guaranteed QoS. When we talk about WAN, most organizations that utilize WAN use a Multi-Protocol Label Switched (MPLS) network.
Because bandwidth limitation and network congestion are factors that are always present in a network, we must have QoS configured correctly to optimize the end-user experience.Īs QoS can be configured end to end, it's more useful that your media traffic traverse over a Wide Area Network (WAN) because a Local Area Network might not have the same network congestion and bandwidth issues.
QoS is commonly used when network bandwidth is limited and the network is congested. Quality of Service (QoS) is a combination of networking technologies that enables companies to optimize the end-user experience for real-time audio, video, and application sharing communications.
This admin guide describes why you need Quality of Service and how to configure it end to end. Improving Quality of Service is important.
To get Skype for Business to work correctly for internal and external users is a complex task as we are dealing with a vast product. This article was written by Balu Ilag, System Administrator, Microsoft MVP OverviewĪs you know, Microsoft Skype for Business is a great product, which has multiple features that help enterprise users communicate and collaborate effectively from anywhere.