Dunno - when I moved into a rented flat 6 years ago my netgear ADSL modem wouldn't work. After far too much time on the phone to my ISP, trying to persuade them that something was wrong, I was given the tip (from the internet) 'change the polarity on your phone line'.
Whipped over a couple of wires and it worked. So how that fits in with the no polarity idea, I don't know.
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