Go to https://settings.webex.com and select Webex Calling.
From the Calling User Portal, go to Call Settings.
Toggle on Call Forwarding.
Select the call forwarding option you would like to use.
Enter number to forward calls to.
Calling User Portal | Call Forwarding
If you're going to be away from your desk but don't want to miss an important phone call, you can forward your calls to another phone number using the Calling User Portal.