Red boxing is simulating the tones produced by public payphones when you drop 
your money in. The tones are beeps of 2200 Hz + 1700 Hz 
Nickle = 1 beep for 
66 milliseconds. 
Dime = 2 beeps, each 66 milliseconds with a 66 millisecond 
pause between beeps. 
Quarter = 5 beeps, each 33 milliseconds with a 33 
millisecond pause between beeps. 

There are two commonly used methods 
being used by Phreaks to make free calls. 
1. An electronic hand-held device 
that is made from a pair of Wien-bridge oscillators with the timing controlled 
by 555 timing chips. 
2. A tape recording of the tones produced by a home 
computer. One of the best computers to use would be an Atari ST. It is one of 
the easier computers to use because the red box tones can be produced in basic 
with only about 5 statments. 

--------------------Jolly Roger 

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