Hermes was one of the first point-to-point over cellular modem ideas I believe. The algorithm doesn't look that complicated, but I would guess the difficulty is in the details. They say they could get 1200 bps through the phone, which is less than the 1600 bps used by the sm1000.
As far as I know, jackpair has never been shown to work, and being a year late there have been no examples of it working. They seem to have blown all their money on a failed plastic injection molding for the case. http://www.news.cs.nyu.edu/~aditya/Research_files/dhananjay-mobicom10-hermes.pdf
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