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You can see Lync Server 2013 client inoperability support here. In Part 2, we’ll add File Transfers, Application Sharing, and SIP to this list just in case you want to provide a more robust Qo S configuration to your environment that extends to more than just Audio/Video. Windows XP uses separate QOS Group Policy Options that do not allow you to restrict the DSCP values at the application level.
Windows Vista, Windows 7, and Windows 8 utilize Policy based QOS. This means that all applications that utilize the Audio/Video ports we configure for Audio/Video will get DSCP markings stamped.
Being able to break up each modality is a feature of Lync.
Because Lync Server 2013 only supports IM/Presence from Office Communicator R2 clients, if you are in a Lync Server 2013 environment with no Lync 2010 Servers, Client Media Port Range is unnecessary to configure.
The commands are: Note: -Client Media Port Range is used for Office Communicator 2007 R2 Clients.
The reason why this uses 40 is because this setting includes all modalities as Office Communicator 2007 R2 did not split apart each modality into their own separate switches.
Keep in mind that this article is only for the ability to enable QOS, it is not a comprehensive guide on all the various dynamic ports available in Lync to lock down your firewalls. Second of all, the question may arise, why and when would you want to enable Qo S?
Audio and Video are synchronize traffic that can be affected by jitter, delay, and packet loss on an IP Network.
The following commands are where we finally choose the amount of ports and at what port each modality starts.
To better understand Diff Serv and its affect on the network, please check out the excellent blog article written by fellow Lync MVP Jeff Schertz at the following URL: So, let’s dive into my version of how to enable Qo S. Part 1 Part 2 In order to successfully deploy Qo S, it helps if you have a table with all the various information needed.
Lync 2013 allows legacy Lync 2010 clients to connect to Lync 2013.
The legacy Lync 2010 client’s executable name is whereas Lync 2013 now uses the executable name of
For Attendant clients, Lync 2010 Attendant is the current solution and the executable name is Attendant
When enabled, clients will use the specified port range for media traffic.