The_hacker_club - How Caller ID works

 ALMOST EVERYTHING ABOUT YOUR PHONE   
                                         
Inforation taken from the Internet u fido.                         
Accuracy is not guaranteed.                               
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           The principle of operation of Caller ID            
                                         
    Calling phone number information
th subscribers are needed first
to issue an invoice for long-distance payments
th conversation.  Caller ID equipment except auto-
automatic issuance of the calling number
nenta allows you to issue a number
category assigned to one or another
to the subscriber.                                
    Considering the transmission range of the accelerator
tract, information about the number of the transfer
is given in the form of sound frequencies, or rather -
in the form of two-tone standard signals
MCTT.                                    
                                         
 Categories of subscribers There are 10 types of categories:      
                                         
 1) Residential, institutional,
having the right of intercity and international
no connection.                               
 2) Hotel subscribers entitled to
the same types of communication (this category of subscribers
highlighted because in this case the account
must be issued immediately).       
 3) Subscribers who do not have the right to access
intercity and international networks (eg
example of a dormitory).                        
 4) Subscribers who have priority
establishing a connection (priority).          
 5) Subscribers who have the right to communicate without
tariffs.                             
 6) Category of long-distance telephones -
machine guns                               
 7) Subscribers with rights other than communications
with intercity and international networks
receive additional paid services.  
 8) Subscribers who have priority
establishing communication inintercity networks
and the right to paid services.               
 9) Category of landline phones - auto
mat.                                   
 10) Reserve.                            
                                         
    Issuing call number and category -     
            of the current subscriber.            
                                         
    Issuing caller number and category
subscriber is carried out by multi-frequency
in a non-interval "two out of six" manner.
Frequencies 700 are used for this purpose,
900, 1100, 1300, 1500, 1700 Hz. I act-
The total signal value is 0.33 V. Total applica-
There are 12 frequency combinations.             
                                         
1 - 700, 900; 2 - 700, 1100; 3 - 900.1100
4 - 700, 1300; 5 - 900, 1300;            
6 - 1100, 1300; 7 - 700, 1500;           
8 - 900, 1500; 9 - 1100, 1500;           
0 - 1300, 1500;                          
Start - 1100, 1700; Repeat - 1300, 1700.
                                         
"Start" - indicates the beginning or end
tion of a packet of dual-frequency messages.         
"Repeat"- used when
number of the calling subscriber in a row
the same numbers are blowing.  With no pause
method of transmitting information to distinguish
Some combinations from each other are impossible.
Duration of each dual-frequency message:
40 +-2ms.                                
    Information about the category and call number
subscriber contains 10 dual-frequency
parcels.                                 
                                         
    Connecting Caller ID equipment to the PBX.    
                                         
    After dialing the number of the called party,
nenta and occupation of the receiving device on
ATE (or response from TA local communication), sra-
K2 number identification relay is activated on
time 4OOmc. This closes the contact
K2.3 and the transmitting device is connected
Caller ID.                                     
    The subscriber line is disconnected by contact
tami K2.1 and K2.2. This is necessary for
so that the signals appearing at the output
microphone in the caller's phone
did not affect the transfer of information. If for
this time (400 ms) on the connecting line
signal will be received from the receiving device
nusoidal request signal with frequency
500 Hz+-1% with a level of 4.3 dB and continuous
ity is 100 ms, then the circuit is generally
time delay prolongs the holding timerelay K2 for another 500 ms for transmission
information about category and phone number
caller.                    
    AC Request Signal Indus-
transferred to winding III of transformer T2
and through the subscriber kit goes to
Caller ID transmitting device. The last one,
having received a frequency request, it begins issuing
information.   Information from the transmitter
device Caller ID is transmitted to winding III
transformer, induced in windings I
and II and is transmitted over the trunk line
on AMTS.  Receiving devices on automatic telephone exchange
convert frequency combinations into digital
enter the code and remember the received number.  
    After receiving information about the number and
caller categories on the telephone exchange
connection to the subscriber begins
nentu of another city.                    
    To increase the reliability of determination
caller's phone number and category
subscriber in the Caller ID system will be accepted three times
new launch of transmitting devices. Yes, es-
when you first start Caller ID on the receiving
at the end the number was not determined (for some reason
reasons the Caller ID information was not accepted),
then the receiving devices briefly os-
are released (without breaking the connection) and
send a request signal again to start
transmitting devices. If at the same time in-
the formation will not be accepted, then it is formed
third request signal.  In case of absencenumber identification procedure and after the third
launch, the output to the telephone exchange is interrupted.       
    The Caller ID transmitting device will work
The same is true if the request signal is
children are not transmitted from the receiving device
va AMTS, and from a local phone with Caller ID.    
                                         
       Fixed Caller ID equipment       
                                         
    Information from the transmitting device
Number identification equipment (PEU Caller ID)
transmitted upon request from the USPI (device
requesting and receiving information). Signal "For-
caller ID" from UZPI is transmitted on the frequency
500 +-5 Hz with a level of -4.Zdb in combination with
linear signal "Answer", plus on
conversational wire. Line duration -
of the signal is 1.8 +-0.2 sec.,
frequency signal is transmitted with a delay
250-275 ms with a duration of at least 9Omc.
Information is transmitted multi-frequency
using the "intervalless packet" method.
When transmitting a "no-interval packet"
two identical code combinations cannot be
Gut follow one after another. In case
presence in the subscriber number of two or more
consecutive identical numbers, each
the second digit is replaced by a service sign
- code combination. Code combination
marks the beginning and end of a packet. Day-
The current signal value is 0.33V.Information is transmitted in a non-stop manner
     ("intervalless packet" method)     
          in the following order:           
                                         
1. Subscriber category number.   
2. Number units digit.        
3. Ten digit of the number.       
4. Zugfra thousand numbers.       
5. 3rd digit of the station index.  
6. 2nd digit of the station index.  
7. 1st digit of the station index.  
8. Code "start=end"          
                                         
    Deviation of each signal frequency
relative to its nominal value +-
1SHz. Duration 40+-2ms. Level (dB):
-6.5 to 27.4 (29.0; 31.0; 32.6; 34.3;
36.9 respectively).                    
    Each subscriber has its own category
(apartment telephone, institution, guests)
personal, cool user, public phone
vocation, etc.). There are 10 different ca-
category, the number of which determines the right
use of intercity and international
connection and something else.                     
    In USPI, the tenth digit is compared with
first and if they coincide, the accepted in-
the formation is considered reliable. If
the information received is not reliable, then the UZPI
sends a repeat request. Information from
ANI PEU can be requested up to three times. 
                                         
  Frequencies used fortransmission   
        "intervalless packet"        
                                         
    All information is generated by a combination
tions of 2 frequencies based on 6 basic ones: 
                                         
F0=7OOHz                       
F1=9OOHz                       
F2=11OOHz                      
F4=13OOHz                      
F7=15OOHz                      
F11=17OOHz                     
                                         
0 = F4 F7                      
1 = F0 F1                      
2 = F0 F2                      
3 = F1 F2                      
4 = F0 F4                      
5 = F1 F3                      
6 = F2 F4                      
7 = F0 F7                      
8 = F1 F7                      
9 = F2 F7                      
"start=end" = F2 F11        
"repeat" = F4 F11              
                                         
    The duration of transmission of each frequency is
combination (according to GOST) CHOMS (and real-
but can fluctuate from about 2Smc as much as
up to 7Omc!).                               
    PEU AON transmits ("duplicates") information
mation several times, the package ends
can also be "any place". This way
So, when determining the number you need to take into account
appearance of the "start-end" code.           
   EXAMPLE: number 1234567, category 9,
can be issued like this:                    
         97654321_97654321_976,          
where "_" is the code "start-end"               
   Or it can be issued like this:               
           4321_97654321_97654           
   There might be this option:           
     1_97654321_97654321_97654321_9      
 And this:                              
               4321_97654                
    Two identical code combinations are not
can follow each other, while
if there are two repeating ones, then
the first of them is replaced by the "repeat" code.
    EXAMPLE: number 2250145, category 5.
One of the package options could be
coy:                                     
           Р54105Р2_Р54105Р2_            
where the symbol “P” denotes the “repeat” code. 
                                         
    If used in a populated area
the number of digits in the number is less than 7, then from
it follows that:                      
                                         
 v If this is a regional/zonal center, then
the number is padded “in front” with zeros or
in twos, and the information received gives
as above, for example, number in
Kharkov - 411199, category 3, you will be
given like this:                                 
3Р91Р140_3Р91Р140_                       
                                         
 v If this is another locality,
connected to the zonal intercity station
tion (located in the zonal center), then
the number is supplemented "in front" to 7 digits
mi numbers that are used in the code
of this locality when communicating within
zones (this is the so-called "zonal no-
measures").  For example, the city code of Balti (zo-
national center Chisinau) within zone: 231
(where the first digit indicates the connection within
zones), outside the zone: 04231 (where per-
The first 3 digits are the direction code, i.e. zo-
intercity station).  Let's take it
the last two digits of the code and supplement them
number (for example, 12345, category 1), semi-
tea: 3112345 - this is the zonal number
measures  This is what will be broadcast
Caller ID equipment, example package:          
15432Р13_15432Р13_15432                  
                                         
 v In some localities where
numbering less than 7 digits may
be observed at stations where caller ID equipment
produces a non-standard package. But this follows
should be considered a deviation from the generally accepted
standard for PEU signals AON.            
                                         
          Caller ID EQUIPMENT ON PBX          
                                         
    Caller ID equipment consists of transmitting
and receiving devices. Transmitting devices
systems are installed on regional automatic telephone exchanges,
reception areas - on automatic intercity-
new telephone exchange (AMTS). Adopted
The device can also be a telephone
local communication device (TA) for local communication with Caller ID.
After dialing the number of the called party
and occupation of the receiving device on the automatic telephone exchange
(or response from TA local communication), triggered
Activates the number identification relay on 4OOmc.
This closes the contact and connects
xia transmitting device (PU) Caller ID. Abo-
Nent line is turned off.              
    This is necessary in order for the signal
ly appearing at the microphone output in
caller's phone number had no effect
for the transfer of information. If during this time
(4OOmc) along the connecting line from the receiving
the requested device will receive a request signal
frequency 500+-1% Hz with a level of 4.Zdb and
duration 1OOmc, then the circuit is generally
slow shutter speed prolongs holding time
relay for another 5OOmc to transmit information
about the category and number of the caller
ta.                                      
    AC Request Signal Indus-
is transferred to the transformer winding and through
the subscriber kit arrives in re-
Caller ID giving device. The latter, having received
frequency request, starts issuing information
mation.Information from the transmitting device
of the caller ID is transmitted to the transformer winding
torus, is induced into other windings and
transmitted over the connecting line to the telephone exchange.
 Receiving devices on automatic telephone exchanges are converted
convert frequency combinations into a numerical code
and remember the received number.          
    After receiving information about the number and
caller's phone category,
In the Caller ID system, a three-time start is accepted
transmitting devices. So, if during per-
during the launch of Caller ID, on the receiving side no-
measures have not been decided (for some reason-
Caller ID information was not accepted to us or
accepted as distorted), then the receiving devices
properties are released for a short time (without
connection failure) and send again
request signal to start transmitting
devices.  Even if the information is not
is accepted, then the third sig-
cash request. In the absence of a defined
When the number is removed, the output to the telephone exchange is interrupted.  
    The Caller ID transmitting device will work
The same is true if the request signal is
children are not transmitted from the receiving device -
AMTS service from a local phone with Caller ID.
The only difference is that if
over a certain period of time
neither the PBX transmitting device will receive
request for one reason or another, or itself
the transmitting device will not provide information
tion - the spoken path is connected andsubsequent requests from local TA with Caller ID
just useless. However, when determining
long-distance number, some number
number of sequential requests
buys time to connect the connection
caller's body path and
determining its number.                  
                                         
           Anti=AON            
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 INTRODUCTION                 
                                         
    Currently there is widespread
distribution automatic detection
tel numbers (Caller ID) collected on various
base (KPS8ОВМ80А, Z80, 181bVECH9, set-
hard logic K155, K564, etc.). All
these systems are focused on determining
caller numbers according to information
tion sent by the station in response to a request
increased with a frequency of 5OOHz - 2.SkHz in two-tone
Nom code "2 of 6" coding frequencies
700, 900, 1100, 1300, 1500 and 1700 Hz
signal deviations of no more than 15 Hz and
lasting no more than 32 ms.            
    The device, the description of which is given
below, allows you to “blind” such
number identification system.TECHNICAL DESCRIPTION           
                                         
       1. PURPOSE AND CAPABILITIES       
                                         
    Telephone detection protection system
phone number allows, based on modern
implement variable electronic equipment
possibilities for protection against the determination of Va-
your number when calling
to the subscriber who has the systems installed
Caller ID "Rus" type, etc.                    
    This system can be used as
built into the telephone set, and in
as a separate set-top box for a telephone
apparatus.                                
                                         
     1.1 FUNCTIONAL CAPABILITIES      
                                         
    Telephone detection protection system
phone number (anti-caller ID) provides
protection of your number from telephone identification
nent when using the Caller ID system
any type.                             
                                         
      2. TECHNICAL CHARACTERISTICS      
                                         
    Technical characteristics of the telephone
th device equippedanti-AON, maybe
but conditionally divided into two groups. B
the first group will include characteristics that
existing for this telephone set (electronic
troacoustic parameters). These characteristics
istics are completely determined by the use
usable base device.                
    The second group of characteristics defines
is performed by a specific function,
handled by this system. It should be noted
that to perform this function this
the system imposes more stringent requirements
connection to the telephone channel and satisfy-
can only work with telephones
lines whose characteristics correspond to
meet the standards.                           
    Caller ID protection system
has the following technical characteristics:
ristikami:                               
                                         
number of operating modes:..............2
probability of protection from number identification 
with proper use of the system:....0.95
probability of complete “blinding” of the equipment 
Caller ID tours (no tone sending  
completely):...........................0.55
operating time, s:.....................10-60
supply voltage, V:............4.9-5.3
power consumption, mW:..no more than 200
ambient temperature, C:...-5 +30
                                         
        DESCRIPTION OF VARIOUS NODES         
                                         
    From the analysis of the circuit diagram of the system
Caller ID protection topics are visible,
that this system is built on the basis
series hard logic kit
SN7440. The basis is the generator generator
torus tuned to a frequency of 12.626262 Hz.
    The second functional unit is
amplifier stage assembled on trans-
resistor 2N2904, amplifying the pulses so
commercial generator required for operation
third functional unit - execution
body part.                           
    The executive part represents the co-
fight relay type RESbChA passport RSCh.569.724.
                                         
 OPERATING PRINCIPLE OF THE PROTECTION SYSTEM      
    FROM DETERMINING PHONE NUMBER    
                                         
    The operation of the protection system is based on
impact on the information receiving path
Caller ID systems,bypassing voice blocking
path of the calling subscriber and it is impossible
the possibility of transmitting any digital
or analogue signals during transmission
transmitting information about his number. Osu-
This is accomplished by transmitting to the station
non-tonal information through circuit-
line channel with a frequency of 12.626262 Hz.     
                                         
             PROTECTION SYSTEM              
    FROM DETERMINING PHONE NUMBER    
       USED INSTRUCTIONS        
                                         
        1. HARDWARE IMPLEMENTATION         
                                         
    Structurally, the protection system is
in the form of a separate module, filled
epoxy resin to protect the
diodes from external influence.      
                                         
       2. BRIEF DESCRIPTION OF THE WORK        
                                         
    When anti-Caller ID is turned on correctly and
When you press the button you will hear a characteristic
quiet rhythmic crackling with frequent
that about 13 Hz, which indicates
normal operationdevices. On vacation
pressing the button and lifting the handset, the telephone
of the device in the handset should be audible
long beep; in its absence should
press the PTT button: when you press the button in
The receiver should hear a crackling sound with a frequency
Around 13 Hz is quite loud.  
    The above conditions are evidenced
talk about correct and normal operation
devices.                              
    When working directly with anti-
Caller ID performs the following actions:
the number you need is selected and after connecting
When the line is removed, the anti-Caller ID button is pressed and
lasts approximately from 10 to 60 seconds
kund;  if after releasing the button in
You can hear on the phone that the station is starting to send
send a tone message to your subscriber, then
you should press for a while
button.                                  
                                         
      3. OPERATING INSTRUCTIONS      
                                         
    There is a common opinion that
a properly assembled digital system from
does not require any adjustments and starts working immediately
zu; nevertheless, if present in the scheme although
one fault finding task and
its localization becomes practically impossible
solvable without the use of specialized
bathroom systems.                           
    Setup starts with verificationknow
changes in the supply voltage, which should
It is necessary to be in the range from 4.9 to 5.3
Volt.  Then you need to achieve the frequency
master oscillator assembled in logic
logical elements DD1.1, DD1.2, DD2.1,
capacitor C1, resistor R1, equal
12.626262 Hz. Some deviations are possible
from the specified frequency, but not
compliance with the above is guaranteed
parameters.  After this, connect the trans-
resistor VT1, resistor R2, which serves for
more stable operation of the relay, and relay K1 and
check the operation of the entire device in central
crowbar: when you press the button, the
walk relay activation with frequency      
12.626262 Hz.                            
    During normal operation of the anti-Caller ID, it
can be connected to the telephone network.      
                                         
        SPECIFICATIONS OF RADIO COMPONENTS        
          AND THEIR POSSIBLE REPLACEMENTS          
                                         
                                         
  +-------------+--------+------------+-------------------+  
  | Designation |  Type | Noinal | Acceptable zayen |  
 | on the diagram |        |             |                   |  
  +-------------+--------+------------+-------------------+  
  | DD1, DD2 |SN744O |    - | K1ZZLAb |  
  +-------------+--------+------------+-------------------+  
  | VT1 | 2N29О4 |    - | KTZ15 |  
  +-------------+--------+------------+-------------------+  
  | R1 | CPS-2 | 2.2 koi | < 6.8 kOi |  
  +-------------+--------+------------+-------------------+  
  | R2 | MLTO.5 | 1 koi | 1.1 koi |  
  +-------------+--------+------------+-------------------+  
  | C1 | K5318 | 22Oif*6.3V |         - |  
  +-------------+--------+------------+-------------------+  
  | K1 | PRESBCHA | PCCh.569.724 |         - |  
  +-------------+--------+------------+-------------------+  
                                         
               NOTES                
                                         
    1. When replacing radio components abroad,
th production of their Soviet counterparts
Reliable operation of the system is not guaranteed
and compliance with all of the above pa-
parameters when working with Caller ID of any type.   
 2. It is possible to change the master circuit
generator using other logic
ical elements: SN7420 type microcircuits,
SN7400, SN7422, as well as generator, st-
powered by a quartz resonator.ПРИНЦИПИАЛьНАЯ СХЕМА АНТИ-АОН      
                                         



















                                         
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