This unit requires POTS (plain old telephone service) .. thats the normal phone jack that you would find in your home ..the base station is connected to that via a standard phone cord .. if you have digital phone service (many businesses) then you would need a digital adapter (availible from polycom) .. or you can connect it to most Cell phones via a standard 2.5mm sterio (headset) cable.. (male/male) you can view these things here http://www.officedirectinc.com/Phones/poly2w.htm
the "EX" in your part number indicates that its expandable . you can add up to two wireless microphones
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This unit requires POTS (plain old telephone service) .. thats the normal phone jack that you would find in your home ..the base station is connected to that via a standard phone cord .. if you have digital phone service (many businesses) then you would need a digital adapter (availible from polycom) .. or you can connect it to most Cell phones via a standard 2.5mm sterio (headset) cable.. (male/male)
you can view these things here
http://www.officedirectinc.com/Phones/poly2w.htm
the "EX" in your part number indicates that its expandable . you can add up to two wireless microphones