Nortel - Norstar 7310 "NEED HANDSFREE"

I have a Norstar phone on a call pilot 100 system. Ever since the Techs installed the system the usual Admin. codes to change things in the phone do not work. Now I need to use a headset with the phone but when I plug it into the phone I get the message "NEEDS HANDSFREE". Any ideas how I can set this up?

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