All calls—You can choose to have calls always forwarded to a specific phone number here. You can choose to play a brief tone whenever a call is forward by selecting the check box.
When busy—You can set up an internal or external phone number to forward to when the line is busy.
When no answer—Select this option to set up a forwarding option when a call exceeds a certain number of rings. Enter an internal or external phone number to which the call will be forwarded. If you choose a valid internal phone number, you can also select the option to send to voicemail. Select the amount of rings before playing a greeting from the drop-down menu.
Business Continuity— Business Continuity settings are used to forward calls if users cannot be reached. For example, if your office loses connectivity, continuity settings will be activated. Enter an internal or external phone number to which all calls will be forwarded. If you choose a valid internal phone number, you can also select the option to send to voicemail.
From the customer view in https://admin.webex.com go to Users and select the users that you want to enable call forwarding for.
Select Calling and choose Call Forwarding.
Turn the Call Forwarding Service switch on, and choose the settings you want to enable.