To forward your phone to another number, you can call *2 followed by the number to which you want to transfer your call and # as on all phones within UGent. So e.g. *2 0 0477xxxxxx # and press OK.
You only need to use the extra zero when forwarding to an external number. Switching off is done with #2 and OK.
If you want to transfer the call while you are on the line, you can use the arrow keys during the call and go to 'Callback' (if you first want to give a short message to your colleague) or 'Transfer' (if you want to transfer blindly without a prior conversation with the person you are transferring to).