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COMMUNICATION SYSTEM NETWORKING — AN OVERVIEW 2-15
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PARTITION
GROUP
NUMBER
(S75/G2)
YES (S85/G2)
NO
1
?
IN POSITION
0
(S85/G1)
PARTITION
TENANT
NPA - NNX - XXXX
NNX-XXXX
OR PRIVATE NETWORK
PUBLIC NETWORK 16-28, 120
40-49, 108,
109, 120
TRUNK TYPES
FOREIGN
NPA
TABLE
6-DIGIT
TABLE
HOME
NPA
TABLE
IN POSITION
0 OR 1
2
?
YES NO
MATCH
WITH
LOCAL
CALL LIST
OBTAIN
PREFERENCE
FROM
PATTERN
PREFERENCE
DATA
OBTAIN
PATTERN
RNXs
TO AAR
MATCH WITH
10-TO-7 DIGIT
CONVERSION AND
UNAUTHORIZED
CALL TABLE
9 + (NPA) + (NNX) + EXT
FROM
INTERNAL
DIAL
PLAN
01X IN
1ST 3 POSITIONS
YES (S75/G1)
Figure 2-3. ARS Processing
• Unauthorized calls. These ARS sends to intercept.
• International exceptions. These ARS sends directly to pattern selection. This capability is especially
helpful in routing international calls that require special handling. It is available on the System 85
R2V4 (Issue 2.0) and Generic 2.1 communications systems only.
During digit analysis, ARS analyzes the dialed number to determine the appropriate treatment for the call.
ARS processes the call as follows, depending upon the digits it finds in the first part of the dialed number:
• 01X in first 3 positions — ARS knows that it is an international call and compares the dialed number to
entries in the 10-to-7 conversion table. When it finds a matching entry, it processes the call as shown
above.