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I cannot seem to get a Plantronics adapter and GN headset to work.. I bought the adapter.. then got a headset. I connect the handset to the adapter.. connect the adapter to the handset jack in back of the phone.

The "headset" button we programmed does not work.. when I hit the button... i can neither hear nor talk via the headset... however muting via the plantronics adapter DOES in fact mute the phone's handset.

Other than the "headset" button, is there any programming I must do? This cannot be that difficult.