A Java Modem to send data over the voice channel of a Cell Phone. This is just experimental code. I'm interested in playing with the modem. Not the crypto, and other layers.
The JackPair pulse modem version is newer. The translation to Java was pretty straight forward. None of the 32-bit based design was necessary, so I used integers and bytes. Indexes were used instead of pointers.
See:
http://torfone.org/pairphone/index.html
http://torfone.org/jackpair/index.html