You have the ability to add extensions to users inside your company as well as remove them.

Assign Numbers to Devices and Connect a Number to an Extension

At any time, you are able to assign numbers to the many devices that belong to a user. You have the ability to provide users extensions that are connected to their main work number. Displays on phones will reflect any extensions that have been assigned.

1 Go to the Users section in the customer view of https://admin.Webex.com, and then choose the user to whom you wish to give a number.

2 Navigate to the Calling menu and then select the Add a New Line option.

3 After making your selections in the respective drop-down lists, click the Save button to commit your changes.

Remove an Extension

At any moment, you have the ability to remove extensions that have been allocated to a user.
1 Go to the Users section in the customer view of https://admin.webex.com, and then choose the user whose account you wish to remove the extension from.

2 Select the extension that you wish to delete from your phone by clicking the Calling tab.

3 Select the icon, then select Remove Line from the menu that appears.

4 Select the Remove Line option.