Do you have Skype for Business? If so, you either have a Lync server on-site (Lync is the former name of Skype for Business) or you have a cloud service with Office-365.
If you have an Office-365 service, do you want to control Skype for Business through powershell? Here's how:
1-install SKYPE-FOR-BUSINESS POWERSHELL-MODULE: https://www.microsoft.com/en-us/download/confirmation.aspx?id=39366
2-start POWERSHELL (as-admin).
3-type: Import-Module SkypeOnlineConnector
4-type: $LiveCred = Get-Credential
5-type in your username/password.
6-type: $sfbSession = New-CsOnlineSession -Credential $LiveCred
7-type: Import-PSSession $sfbSession
type: Get-CsConferencingPolicy -identity global
type: Set-CsConferencingPolicy –Identity global –EnableDialInConferencing $True