From the customer view in https://admin.webex.com, go to Users and select the user that you want to edit.
Under Ring all devices and applications whenever, choose the ringing behavior for the user's devices in these scenarios:
Under Webex Calling Applications, choose the available devices licensed with the Webex Calling application for the user.
Click Save to confirm your changes.
Manage Application Services for a Webex Calling User in Cisco Webex Control Hub
Application services lets you determine the ringing behavior for calls made to users in certain scenarios. You can also specify which devices users can download the Webex Calling app on.