Note: The AT&T patent in question is actually 775 rather than 755: http://www.google.com/patents?id=UOMZAAAAEBAJ&dq=4555775 http://www.google.com/patents?id=UOM

Note: The AT&T patent in question is actually 775 rather than 755: http://www.google.com/patents?id=UOMZAAAAEBAJ&dq=4555775 http://www.google.com/patents?id=UOMZAAAAEBAJ&dq=4555775 This was posted a few years ago and that also resulted in a fairly interesting HN thread: https://news.ycombinator.com/item?id=607335 https://news.ycombinator.com/item?id=607335