Your expansion box is a CAP (central answer position) module. I will assume you are using the same jack as before. The line cord, from phone to jack should be 6 conductor (count pins on end). A short line cord runs from back of phone to back of CAP (plugs on CAP are labelled) then the longer cord runs from CAP to the wall jack.
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Your expansion box is a CAP (central answer position) module. I will assume you are using the same jack as before. The line cord, from phone to jack should be 6 conductor (count pins on end). A short line cord runs from back of phone to back of CAP (plugs on CAP are labelled) then the longer cord runs from CAP to the wall jack.