THE ~W~$~ BOX
    
    The Cheese Dox is simply a conference line, or loo~around.
    They are very popular with booLies who place bets by phone,
    because their clients call one number, and the bookie calls
    another, and police won't find the bookie at the location of
    either of the two numbers. This is precisely why loops have
    been a favorite of phone phreal;s, too.
    
    Bell's loops are limited because they often disconnect after
    a cortain time, one of the two numbers must be called first,
    and they are often monitored and sornetimes even charged.
    Ihe Cheese Box can be extended to many lines, thereby cre-
    ating conferences, and will let either line be called first and
    hang on indefinitely. Last but certainly not least, the Cheese
    Box is free
    
    Phone voltage is normally 45 volts. When the phone rings,
    a 90 volt AC signal is applied to the line. The zener diode
    condocts if the voltage rises to 56 volts, thus it conducts as
    the phone begins to ring, in fact, before the phone rings. As
    soon as it conducts, the phone equip~nent thinks you picked
    up (because current is drawn by the zener) and the voltage
    drops below She zener volta~e, and it stops conduoting. A11
    this happens so quickly tbat essentially the zener conducts
    ~or only a few milliseconds, and the billing equipment does
    not start. If yon call from a local pay phone, you will get
    your dime back. And you can hold on until someone ca~ls
    ~n on the other line or lines. When they do. their l~ne will
    be answered in the same way and you can then ta~ to each
    other. The capac~tors prevent the DC voltages on the lines
    from interfering with each other. Either side of the line can
    affect the line status if allowed to touch another line.
    
    Install the zener diode tothe red and green wires of your
    phone line. If you install it backwards, there will be no dial
    tone on your phone, if so, roverse the wires from the zener.
    
    A zener diode will conduct electricity when the anode is
    more positive than the cathode, or wLen the cathode is more
    than a certain number of volts more positive than the anode,
    in this case 56 volts.
    
    S:nce the phone company has a special hatred for phone
    atbachments that cause free calls, many boolcies use the
    Cheese Box for only a few minutes, since calls over 3
    minutes can be detected if the phone company decides to do
    something about ~t
    
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    Hl,
    Here are some good references on switching systems:
    Bell laboratories record Jan. 70 page 13
    Bell System Technical Journal No~r. 60 page 1381
    l~his one is the best paper on the Bell switching system and
    pages 1398, 1400, and 1422 will give you a good understand-
    ing of how the toll system works. Page 1422 explains super-
    vision principles. Supervision is returned to tbe caller wLen
    ~e called party answers. As a result you get billed. If you
    disconnect(2600) on a ~U caU af~r supervision has been
    returned to you, you will be Limed out by your local office.
    That is7 you wi~1 lose the circuit in 15-30 seconds. If you
    are notsouped, ~en disconnecting wi~ 2630 dees not cause
    time out. On whatcalls are you unsouped? If you call a
    phone tfat has a black box or mute, a call to information,
    service calls, or recorded messages . The phone company
    does not return supervision on 555-1212 so you will not be
    charged. Thus only the first billing entry is made. If you
    MF off of long distance information and call a supervised
    number, the start and stop of conversation will be recorded.
    Ihat is, you will be billed for a call to information wEich
    is IMPOSSIBLE as supervision isn't returned on those c~s.
    You went from an unsurpervised line to a supervisod line
    during the same call which is a dead giveaway that you used
    a blue box. If the phone company is alert you will be nalled
    when they check their billing tapos. Never use long distance
    ~nformation from a home phone. Your security should never
    depend on someone else's stupidi~.
    
    Here are the credit cards for two of those companiespro-
    ducing 2600 detectors.
    
    1 ~ 33
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