This procedure is to be performed from the phone you are call forwarding.
Examples;
To CANCEL CALL FORWARD from your phone, Press Intercom, Dial *7100# ( star seven one zero zero pound ) hear confirmation tone.
To SET ALL CALL FORWARDING from your phone, Press Intercom, Dial *7102 9 cellphone/home phone, then Press # ( star seven one zero two nine cellphone pound key )
So to ALL CALL FWD to your cellphone would look like; Press Intercom *7102918455891234# hear confirmation tone
