This update enables you to use the New-CsCallingLineIdentity cmdlet to create a new Caller ID policy in a hybrid environment of Microsoft Skype for Business Server 2015.
You can either change or block the Caller ID (also known as a Calling Line ID) for a user. By default, the Skype for Business user's phone number can be seen when the user makes a call to a PSTN phone, or when a call comes in. You can create a Caller ID policy to provide an alternative displayed number, or to block any number from being displayed.
How to get this update
To get this update, install the January 2018 cumulative update 6.0.9319.514 for Skype for Business Server 2015, Mediation Server.