In Control Hub, you can specify what information shows for a user when they make a call.
From the customer view in https://admin.webex.com go to Users and select the user that you want to specify the caller ID information for.
Choose which information is displayed when this user makes an outgoing call.
(Optional) Modify the user's caller ID first and last name.
(Optional) By toggling Block Caller ID for Forwarded Calls on, the user's identity is blocked when receiving a transferred or forwarded call.