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Section 700 - Operation Appendix A. ARS and TRS Operation
576-13-700 DBS 576 (USA), Revised 6/11/98 319
5. Calls are screened by first considering the initial digits dialed. In this case, the first Prefix Dialed entry is a
1. This will look at any number that starts with 1. A * is available as a wild card. This represents any single
digit 1-9.
When prefix dial is being considered by the system, the system looks for the longest exact match first. The
system considers a wildcard last. For instance, 911 is considered before *11 or even *. Notice also in this
example there are multiple entries that begin with 9.
If the leading digits needed are to determine the handling of the call, then additional digits can be
considered by entering a Prefix ID that references entries in the Analyze Digits Table. Otherwise, the
Prefix ID is left blank and the additional items are considered.
In this example, we cross reference Prefix ID 1 in the Analyze Digits table for any dialed number that
begins with 1 and Prefix ID 2 for any dialed number that begins with 0. The remaining digits are analyzed
in the Analyze Digits Table.
From Table 7, “Example - User Needs Worksheet,” on page 314 and Table 9, “Example - Origination TRS
Level Plan,” on page 316, the restriction levels are determined for each type of dialed call.
We determine the Route Type depending on the type of call. If the time and or day impacts the cost, then
the time list is used. If the time is not a factor, but multiple trunk groups could be used, then the Route List
is used. If a specific trunk should be used, then we directly reference the Route Table.
Table A-12. Example - Leading Digits Worksheet
Pattern
Number
(1-100)
Prefix
Dial
(up to 10
digits)
Prefix ID
(Go to this
Prefix ID in
Analyze Digits
Tables)
Number of
Following
Digits
Restriction
TRS Level
(Any Origination
TRS at this level or
below will be
restricted)
Route Type
Route Table (0)
Route List (1)
Time List (2)
Route Pattern
Number
Route Table (1-200)
Route List (1-100)
or Time List (1-50)
1 1 1 N/A N/A N/A N/A
2 101****
1
N/A N/A N/A N/A
3 10***
1
N/A N/A N/A N/A
401
2
N/A N/A N/A N/A
50*
2
N/A N/A N/A N/A
60
NA
N/A 8 N/A N/A
7911
N/A
N/A 0 Route Table (0) 1
8*11
N/A
N/A 4 Route Table (0) 1
9 976
N/A
N/A 4 Route Table (0) 1
10 *
N/A
N/A 1 Route Table (0) 1