Phone Systems Tutorial
Phone Systems Tutorial by The Jolly Roger
To start off, we will discuss the dialing procedures for domestic
as well as international
dialing. We will also take a look at the
telephone numbering plan.
North
American Numbering Plan
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In North America, the
telephone numbering plan is as follows:
A) a 3 digit Numbering Plan Area (NPA) code ,
ie, area code
B) a 7 digit telephone # consisting of a 3 digit Central Office
(CO) code
plus a 4 digit station #
These 10 digits are called the network address or destination
code. It is in the format of:
Area Code Telephone #
———
———–
N*X NXX-XXXX
Where: N = a digit from 2 to 9
* = the
digit 0 or 1
X = a digit from 0 to 9
Area Codes
~~~~~~~~~~
Check your telephone book or the seperate listing of area codes
found on many bbs’s. Here are
the special area codes (SAC’s):
510 – TWX (USA)
610 – TWX (Canada)
700 –
New Service
710 – TWX (USA)
800 – WATS
810 – TWX (USA)
900 – DIAL-IT
Services
910 – TWX (USA)
The other area codes never cross state lines, therefore
each state
must have at least one exclusive NPA code. When a community is
split by a
state line, the CO #’s are often interchangeable (ie,
you can dial the same number from two
different area codes).
TWX (Telex II) consists of 5 teletype-writer area codes. They
are
owned by Western Union. These SAC’s may only be reached via other
TWX machines.
These run at 110 baud (last I checked! They are most
likely faster now!). Besides the TWX
#’s, these machines are
routed to normal telephone #’s. TWX machines always respond with
answerback for this
service is "WU FYI MAWA".
If you don’t want to but a TWX machine, you can
still send TWX
messages using Easylink [800/325-4112]. However you are gonna have
to
hack your way onto this one!
700:
700 is currently used by AT&T as a
call forwarding service. It is
targeted towards salesmen on the run. To understand how this
works, I’ll explain it with an example. Let’s say Joe Q. Salespig
works for AT&T
security and he is on the run chasing a phreak
around the country who royally screwed up an
important COSMOS
system. Let’s say that Joe’s 700 # is (700) 382-5968. Everytime
Joe
goes to a new hotel (or most likely SLEAZY MOTEL), he dials a
special 700 #, enters a code,
and the number where he is staying.
Now, if his boss received some important info, all he
would do is
dial (700) 382-5968 and it would ring wherever Joe last progammed
it to.
Neat, huh?
800:
This SAC is one of my favourites since it allows for toll
free
calls. INWARD WATS (INWATS), or Inward Wide Area
Telecommunications Service is
the 800 #’s that we are all familiar
with. 800 #’s are set up in service areas or bands.
There are 6 of
these. Band 6 is the largest and you can call a band 6 # from
anywhere
in the US except the state where the call is terminated
(that is why most companies have one
800 number for the countery
and then another one for their state.) Band 5 includes the 48
the states contiguous to
that one. Therefore, less people can
reach a band 1 INWATS # than a band 6 #.
Intrastate INWATS #’s (ie, you can call it from only 1 state)
always have a 2 as the last
digit in the exchange (ie, 800-NX2-
XXXX). The NXX on 800 #’s represent the area where the
business is
located. For example, a # beginning with 800-431 would terminate
at a NY
CO.
800 #’s always end up in a hunt series in a CO. This means that it
tries the
first # allocated to the company for their 800 lines; if
this is busy, it will try the next
#, etc. You must have a minimum
of 2 lines for each 800 #. For example, Travelnet uses a hunt
series. If you dial (800) 521-8400, it will first try the #
associated with 8400; if
it is busy it will go to the next
available port, etc. INWATS customers are billed by the
number of
hours of calls made to their #.
OUTWATS (OUTWARD WATS): OUTWATS are
for making outgoing calls
only. Largecompanies use OUTWATS since they receive bulk-rate
are in the format of:
(800) *XXX-XXXX
Where * is the digit 0 or 1 (or it may even be designated by
a
letter) which cannot be dialed unless you box the call. The *XX
identifies the type
of service and the areas that the company can
call.
Remember:
INWATS + OUTWATS = WATS EXTENDER
900:
This DIAL-IT SAC is a nationwide
dial-it service. It is use for
taking television polls and other stuff. The first minute
minute costs 35-85 cents.
Hell takes in a lot of revenue this way!
Dial (900) 555-1212 to find out what is
currently on this service.
CO CODES
~~~~~~~~
These identify the
switching office where the call is to be
routed. The following CO codes are reserved
nationwide:
555 – directory assistance
844 – time. These are now in!
936 –
weather the 976 exchange
950 – future services
958 – plant test
959 – plant
test
970 – plant test (temporary)
976 – DIAL-IT services
Also, the 3 digit
ANI & ringback #’s are regarded as plant test
and are thus reserved. These numbers vary
from area to area.
You cannot dial a 0 or 1 as the first digit of the exchange code
(unless using a blue box!). This is due to the fact that these
exchanges (000-199)
contains all sorts of interesting shit such as
conference #’s, operators, test #’s, etc.
950:
Here are the services that are currently used by the 950 exchange:
1000 – SPC
1022 – MCI Execunet
1033 – US Telephone
1044 – Allnet
1066
- Lexitel
1088 – SBS Skyline
These SCC’s (Specialized Common Carriers) are free
from fortress
phones! Also, the 950 exchange will probably be phased out with
the
introduction of Equal Access
Plant Tests:
These include ANI, Ringback, and
other various tests.
976:
Dial 976-1000 to see what is currently on the
service. Also, many
bbs’s have listings of these numbers.
N11 codes:
———-
Bell is trying to phase out some of these, but they still exist in
most
areas.
011 – international dialing prefix
211 – coin refund operator
411 –
directory assistance
611 – repair service
811 – business office
911 – EMERGENCY
International Dialing
~~~~~~~~~~~~~~~~~~~~~
With International Dialing,
the world has been divided into 9
numbering zones. To make an international call, you must
first
dial: International Prefix + Country code + National #
In North America,
the international dialing prefix is 011 for
station-to-station calls. If you can dial
International #’s
directly in your area then you have International Direct Distance
Dialing (IDDD).
The country code, which varies from 1 to 3 digits, always has the
code for the United
Kingdom is 44, thus it is in world numbering
zone 4. Some boards may contain a complete
listing of other
country codes, but here I give you a few:
1 – North America
(US, Canada, etc.)
20 – Egypt
258 – Mozambique
34 – Spain
49 – Germany
52 – Mexico (southern portion)
7 – USSR
81 – Japan
98 – Iran (call & hassle
those bastards!)
If you call from an area other than North America, the format is
the White House from
Switzerland to tell the prez that his
numbered bank account is overdrawn (it happens, you
know! ha ha).
First you would dial 00 (the SWISS international dialing refix),
then 1
(the US country code), followed by 202-456-1414 (the
national # for the White House. Just ask
for Georgy and give him
the bad news!)
Also, country code 87 is reserved for
Maritime mobile service, ie,
calling ships:
871 – Marisat (Atlantic)
871 –
Marisat (Pacific)
872 – Marisat (Indian)
International Switching:
————————
In North America there are currently 7 no. 4 ESS’s that
perform
the duty of ISC (Inter-nation Switching Centers). All
international calls
dialed from numbering zone 1 will be routed
through one of these "gateway cities".
They are:
182 – White Plains, NY
183 – New York, NY
184 – Pittsburgh, PA
186 – Oakland, CA
187 – Denver, CO
188 – New York, NY
The 18X series are operator routing codes for overseas access (to
be furthur discussed
with blue boxes). All international calls use
a signaling service called CCITT.It is an
international standard
for signaling.
Ok.. there you go for now! If you wanna
read more about this, read
part two which is the next file #36 in the Jolly Roger’s
cookbook!
-RFLAGG-