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This post is helpful to know how to change default Lync Client Audio/Video ports.
You will use this if you plan deploy vlan voice and/or need change Lync Client ports.
The default port is 5350 and the range is 40. To see it, run Get-CsConferencingConfiguration
With this command, you can also do other changes like the Max Content Storage, Max upload file size, Client App Sharing Port Range among others….
You can use the following reference documents:
Configuring port ranges