Log into the Cisco Self Care Portal using your SPS credentials.
Click Call Forwarding from the menu on the left.
Your extensions should be listed; check the box next to Forward all calls to:
Next, click the drop down field and click Add a new number.
Enter the forwarding phone number beginning with “8” then click save
To undo the call forwarding, log back into the Cisco Self Care Portal and un-check the Forward all calls to.