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Chaos Computer Club 1997 February
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1997-02-28
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163 lines
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1 N7ERN~
/ ~_
~ Y ~ A R ~ Y
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\
~V {~) [, I
'Blue Box' Is r inkea' fo Phone Call Frau~
By ROY It. SlLVER
aPet'll - ~ - y~ ~"
MINEOI^, L. 1., May 5
Armd with a courr order,
detectives of *~e proiecu-
tor's rackete bilresu and tale~
phtnd compuly '«sonnel
se&rched tho home st 36
Henhawk Rosd last nlght.
they sald Ihcy fnund a smell
box measuring 5 ~y 6 by 3".
Inches attached to a tcle-
Dhone tn the youth's rsom.
The prosecutor did not say
~vhe had made thc bo~ The
telephone compong said snn.
ilar device. had been used
elcewhere tn tbe country.3~e-
f~
The telephone c~npany
came scspic~ous when an~
put« cards showi" the
amoun~t o! time uscd f« in-
fo~mation calls ~ted that
son─calls were talcing much
more than the u~ual one to
~ree ~. _
1
2
3
4
5
6
7
8
g
o
S tart
Stop
700
700
900
700
900
1100
700
gOO
1100
1300
1100
1 500
Disconnect
─FRI:~`
~Ea
· l
T?` AUX.
S~*~R
SP"
/
~y A1 Bell
After inter~ewing engineering students around the country,
I found that the blue box makes tones that are similar to, but
not exactly like a pushbutton p},one. Since operators use the
same device for putt:Lng operator-assistance calls throngh, the
tones were published in the Bell System Technical Journal, 1960
Large lihraries and engineering schools hsve the Journal. Like
a pushbutton phone, two frequencies make up each tone. One of
the "boxers" who was n`: `- caught said, "Those people '!ho were
caugh.t probably called information, 'bleeped' out- the operator,
and redirected the call ~.nth t'ne box, by pressin~ the buttons
of the desired nun~ber. T haven ~ t been cau~;ht ~"cause I call fro
a pay phone, and I ne~rer stay on ~nore than 1~ ~inutes. Most im-
prtantl~, I never use in forr;~ation. I use the Sberaton Hotels
'.!Jatts Line n~,mber, 800~325-3535. R~ght bce fore the~r ans,.'rer, I
bleep thern out ".
Rut ~he blue bo~ isn 't necessary. A cassette tape rr.achine
~nll r.or,~ fi ne. Two ~i=~,al generators are neecled to record the
pa~r of -ones for each di£it, star', and stop. llecord esch
900digi t, ~ you `~11 have ~ r~as ter tape frorn whicl1 to mal;e ac tual
1100phone nu~.,1,er sequences on otl~er machines. One si£na1 ~enerator
1100~nll work ~ f ~,~ou !na,~e the master on ~ stereo tape, and play the
1300two channel~ back to~;ether as you record them on the other tape
1300 For this to work, several rules ??USt be followed:
1300 -K`?cord direct, without microphones, as in Fig. 1 .
1~00 -Record as loud as possible `=thout distort'on. ''Yatch your
1500 record ~neter ~hen ri~aXing tspes.
1500 -Only use fresh batteries, and don' t wear them out.
1500-A better speaker for playing the tones into phones is a stand-
1700ard telephone eargiece . Where you steal one is your problem,
1700( its so easy) but plug it into the ext. speal~er jack as in Fig.
2600t )( -Each tone lasts one second, with one second betY'een esch tone.
However, wait 3 seconds after "bleeping" disconnect tone. Ther.
play KP, area code, number, and ST, in that order.
-Hold your littie makeshift speaker close to mouthp~ ece withou
moving while playing tone s .
-Your electronics friends and young engineers cen help yon get
1' a signal generator or two to use, and they t 11 help you record
~ ^~, the tones properly.
F\Gr. 2 lN~lltJ~q~c -The two frequencies of esch tone must last the entire one sec-
~> ond, and they must start and stop si~ultaneoualy.
, _~
~ .
~ o) .
7 o~c~ 11~trs r~V'.r~ .
CAIJTION: YIPL does not advocate malring free calls. However, YIP]
do~ n't believe in paying for call`;, either. If caught, you may
he char"ed witl, fraud and theft of services. So consider care-
fally ~l~ether you need to call lon~; di..tance, and ~ f. you do"
`:~nside, ,..hother or ~ot ~ron he] ieve in free speech.
I >!
t, ~
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