Toshiba Strata DK 280 Installation Manual page 402

dialed before them. If 1 is not dialed first, the
system knows the three digits are an office code.
The dial plan defines the numbering scheme
applicable to the installation site.
Office Code elements are defined as follows:
+ N=2-9
+ x=0-9
+
NXX = interchangeable with area code; 2nd
digit may be 0 or 1.
+
NNX = not interchangeable with area code;
2nd digit may not be 0 or 1.
Effective January 1, 1995 in North America:
*
a
R
n
Prefix 1 is used only when followed by an area
code. The area code can be the home area code,
depending on the telco's plan in that state.
Area/Office code numbering schemes - All area
codes and office codes will have the format NXX,
making the new plan have both interchangeable
area codes as well as interchangeable office
codes.
Intra-area code toll calls can be according to a
seven-digit only plan in some states. In this case, a
seven-digit call may be a local call or a toll call.
Therefore, only particular office codes can deter-
mine a toll call for a seven-digit call, not the dial plan
in 45-1.
Special Common Carrier Number and Digit Length
For SPCC numbers of the form 950-XxXx, this
program can allow credit card calling but will restrict
the maximum number of digits dialed to prevent defeat
of Toll Restriction.
Selections
On the record sheet for Program 45-1, choose one of
the following dial plans by marking an X in the space
next to the code.
II Select Plan 1 for dialing plan AC+NXX/l+NNX if
the installation is in a location where a user places
a long distance call to a destination outside the
area code without dialing 1 before dialing the area
code. The user places a long distance call to a
destination in the same area code by dialing 1
directly before the office code.
Note:
When using this plan, Strata DK280 Release
3 defaults to Plan 7; Release 1 and 2 software
defaults to Plan 1.
+ The first three digits of a ten-digit number is
an area code if the middle digit is 0 or 1.
+ Pressing the first three digits immediately after
a 1 in an eight-digit string is an office code
+ A seven-digit string starting with an office
code is a local call.
Plan 2 for dialing plan i+AC+NXX/l-tNNX should
be selected if the installation is in a location where
a user places a long distance call to a destination
outside the area code by dialing a 1 before dialing
the area code. The user places a long distance
call to a destination in the same area code by
dialing a 1 directly before the office code
When using this plan, the system recognizes the
following:
+
The first three digits following a 1 in an ll-
digit number are an area code, if the middle
digit is 0 or 1.
+
The first three digits dialed immediately after a
1 in an eight-digit string is an office code.
Select Plan 3 for dialing plan l+AC+NXX/NXX if
the installation is in a location where a user places
a long distance call to a destination outside the
area code by dialing a 1 before dialing the area
code. The user places a long distance call to a
destination in the same area code by simply
dialing the number, without a 1 in front. The office
codes are interchangeable. The system
differentiates between them whenever it sees the
digit 1 dialed.
When using this plan, the system recognizes the
following:
+
If 1 is the first number entered in an 11 -digit
string, the next three digits are an area code.
4
A ten-digit string is not recognized.
+
The first three digits in a seven-digit string are
an office code. (There is no distinction
between local call dialing and long distance
dialing within the area code.)
+ Digits 5 - 7 in an 1 l-digit
string may be an
interchangeable office code as well.
Plans 4, 5 and 6 are not used in the United States.
Plan 7 for dialing plan i+NXX+NXX/NXX should
be selected if the installation is in a location where
a user places a long distance call to a destination
outside the area code by dialing a 1 before dialing
the area code.
9-42 January 1996