On the "Call Diversion" page you can configure call diversion for incoming calls and manage configured call diversion settings.
Setting Up a New Call Diversion Setting
Call diversion entails automatically diverting incoming calls to a previously specified destination. You can configure call diversion for all incoming calls or only for certain calls, for instance, only for calls from contacts in the telephone book. You can specify another telephone line or an answering machine as the destination.
Instructions: Setting Up New Call Diversion
The instructions are presented here: Setting Up New Call Diversion