Step 3: Click on the Extension Manager menu item.
Step 4: Click on the Extension sub-menu item.
Step 5: Select the correct extension.
Step 6: Click on the Options tab at the top.
Step 7: Under Call forwarding, set the extension with the following rules:
Tick the “find me/follow me” checkbox.
Tick the “Call Forwarding on Busy” checkbox.
Add the number you wish to forward the call to (the employees mobile number)