155 lines
7.5 KiB
Plaintext
155 lines
7.5 KiB
Plaintext
The Phreaker's Guide
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to Loop Lines
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by Lefty Carlson
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&
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Landau Ltd
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A loop is a wonderous device which the telephone company created
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as test numbers for telephone repairmen when testing equipment. By
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matching the tone of the equipment with the tone of the loop,
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repairmen can adjust and test the settings of their telephone
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equipment.
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A loop, basically, consists of two different telephone numbers.
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Let's use A and B as an example. Normally if you call A, you will
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hear a loud tone (this is a 1004 hz tone), and if you call B, the
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line will connect, and will be followed by silence.
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This is the format of a loop line. Now, if somebody calls A
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and someone else calls B--Viola!--A and B loop together, and one
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connection is made. Ma Bell did this so repairmen can communicate
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with each other without having to call their own repair office.
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They can also use them to exchange programs, like for ANA or
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Ringback. Also, many CO's have a "Loop Assignment Center". If
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anyone has any information on these centers please tell me.
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Anyway, that is how a loop is constructed. From this
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information, anyone can find an actual loop line. Going back to
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the A and B example, Note: the tone side and the silent side can
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be either A or B. Don't be fooled if the phone company decides to
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scramble them around to be cute.
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As you now know, loops come in pairs of numbers. Usually,
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right after each other.
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For example: 817-972-1890
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and
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817-972-1891
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Or, to save space, one loop line can be written as
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817-972-1890/1 (according to the Landau Shorthand For Numbers.)
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This is not always true. Sometimes, the pattern is in the tens
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or hundreds, and, occaisionally, the numbers are random.
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In cities, usually the phone company has set aside a phone
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number suffix that loops will be used for. Many different prefixes
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will correspond with that one suffix.
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In Arlington, Texas, a popular suffix for loops is 1893 and 1894,
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and alot of prefixes match with them to make the number.
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For Example: 817-460-1893/4
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817-461-1893/4
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817-465-1893/4
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817-467-1893/4
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817-469-1893/4
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...are all loops...
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or a shorter way to write this is:
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817-xxx-1893/4
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xxx= 460, 461, 465, 467, 469
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Note: You can mix-and-match a popular suffix with other prefixs
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in a city, and almost always find other loops or test numbers.
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Note: For Houston, the loop suffixes are 1499 and 1799. And for
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Detroit it's 9996 and 9997.
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When there are a large number of loops with the same prefix
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format, chances are that many loops will be inter-locked. Using
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the above example of Arlington loops again, (I will write the
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prefixes to save space) 460, 461, and 469 are interlocked loops.
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This means that only one side can be used at a given time. This
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is because they are all on the same circuit.
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To clarify, if 817-461-1893 is called, 817-460 and 469-1893
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cannot be called because that circuit is being used. Essentialy,
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interlocked loops are all the same line, but there are a variety
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of telephone numbers to access the line.
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Also, if the operator is asked to break in on a busy loop line
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he/she will say that the circuit is overloaded, or something along
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those lines. This is because Ma Bell has taken the checking
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equipment off the line. However, there are still many rarely used
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loops which can be verfied and can have emergency calls taken on them.
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As you have found out, loops come in many types. Another type
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of loop is a filtered loop. These are loop lines that the tel co
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has put a filter on, so that normal human voices cannot be heard on
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either line. However, other frequencies may be heard. It all
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depends on what the tel co wants the loop to be used for. If a
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loop has gotten to be very popular with the local population or
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used frequently for conferences, etc. the tel co may filter the
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loop to stop the unwanted "traffic". Usually, the filter will be
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removed after a few months, though.
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The wise and knowledgeable phreaker can use loops in many ways.
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If there is a person he/she wants to talk to, but does not want to
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give them their home telephone number, then they can meet on a loop.
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Conferences can be set up on loops. Collect calls can be accepted
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on loops. If a loop is unmonitered, then it can be called free
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from a pay phone (this has many good uses if you think about it).
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Therefore, loops can be a powerful tool if used correctly, and not
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abused. They can make a good phreak's life alot easier.
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I hope that this tutorial is of use to everyone who reads it,
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and was enjoyable. We, here at the Landau Ltd Mansion, enjoyed
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writing it. Look for more articles, files, and tutorials from
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myself, Lefty Carlson, and Landau Ltd in the future.
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PS: Look out for a part 2 of this series. Of which, I plan it to
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include as large a list of working loops as possible. I'm not
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exactly sure how to do it, but if anyone has any ideas please leave
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me mail. Remember: Comments, critisisms, critiques, or other
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criteria are always welcome!
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LOOPS...XXX=467,761,762,763,764,776................... (201) XXX-9929
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XXX-9930
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(202) XXX-9979
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XXX-9999
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XXX=690,534,569,432,868,255,228,677,982,466, (212) XXX-9977
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586,524,283,220,926 XXX-9979
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XXX=360,361,362,363,364,365,681,689 (213) XXX-1118
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XXX-1119
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XXX=652 (302) XXX-9991
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XXX-9992
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XXX=964 (305) XXX-9951
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XXX-9974
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XXX=977,477,751,591,474,671,552,898,875,886, (313) XXX-9996
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321,445,722,281,626,399,868,963,683,237 XXX-9997
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XXX=724 (409) XXX-3110
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XXX-3111
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XXX=656 (412) XXX-4557
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XXX-4558
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XXX=781 (414) XXX-0010
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XXX-0011
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XXX=540 (415) XXX-0044
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XXX-0045
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XXX=746 (616) XXX-9996
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XXX-9997
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XXX=442,960,666,664,780,667,668,489,455,988, (713) XXX-1499
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351,376,447,466,342,493,492,482,441,354 XXX-1799
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XXX=535,778 (714) XXX-1118
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XXX-1119
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XXX=544,528 (805) XXX-0044
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XXX-0045
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XXX=972 (817) XXX-1890
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XXX-1891
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XXX=460,461,465,467,469 (817) XXX-1893
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XXX-1894
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