When you set the company caller ID, other settings affect how the caller ID displays. For example:
If someone has a direct line, that number displays as the caller ID.
If someone doesn't have a direct line, but you've configured the company caller ID, then the company caller ID displays.
If someone doesn't have a direct line, and you haven't configured the company caller ID, then either Unknown or Private display as the caller ID, depending on the phone model.
From the customer view https://admin.webex.com go to Services and choose . Then scroll to Company Caller ID and turn it on.
Enter a Caller ID Name, and then enter a Caller ID Number in the format area code + phone number or pick a Cisco Webex Calling (formerly Spark Call) number from the list. Click Save.