Sennheiser Avaya 1400 & 9000 series set up (Cat #2164). 1) Plug the cord with the green sticker into the PHONE port in the back of the headset base 2) Plug the cord with the pink sticker into the ACC port in the back of the headset base 3) Plug the other end of the EHS into the HEADSET jack of the phone 4) Set compat to A and move dipswitch #1 down Note: If this is their first EHS cord, they will have to enable hookswitch mode in the Web GUI (snippit from manual below)
