Explanation/Reference:
Explanation:
The Set-CsUser cmdlet enables you to modify the Skype for Business Server 2015-related user account attributes that are stored in Active Directory Domain Services. For example, you can disable or re-enable a user for Skype for Business Server 2015; enable or disable a user for audio/video (A/V) communications; or modify a user's private line and line URI numbers.
The AudioVideoDisabled indicates whether the user is allowed to make audio/visual (A/V) calls by using Skype for Business. If set to True, the user will largely be restricted to sending and receiving instant messages.
References:
https://technet.microsoft.com/en-us/library/gg398510.aspx