You can set up call forwarding for your Cisco IP Phone through the Cisco Self Care Portal with the Call forwarding options.

You can't set a schedule via call forwarding but you CAN set a schedule if you are associated to your extension # via your Directory ID and you use Single Number Reach.

Set forwarding for all calls

NOTE: If you are accessing the Cisco Self Care Portal from off campus, you will first need to connect to VPN.

1. Go to Cisco Self Care Portal. 
2. Click the Phones tab.
3. In the left navigation pane, click Call Forwarding.
4. Click the phone number on which you want to set up call forwarding.
5. Check the Forward calls to: check box.
6. From the Forward calls to drop-down list box, enter the phone number to which you want to forward all calls.
   NOTE: You MUST add a 9 for a non-UMD line, enter the number as if you were dialing it from your office phone. For example: 93015551212 for local non-UMD and 914155551212 for long Distance.
7. Click Save.

Learn more about call forwarding and the Self Care Portal at Cisco Product Support.

Information courtesy of Cisco.