We want to be able to use a regular speakerphone we have with this system. One option is to just dedicate one of our jacks for this purpose. could i then just connect this jack directly to the phone company box and thus bypass the nortel system? so then that line coming in from the phone company would have 2 sets of wires on it. one from the jack with this regular phone and one from the nortel system. would there be any problem with this? thx!