The following information illustrates the digit evaluation scheme.
Digit Evaluation
Quantity Of Digits
Dialed
Actual Dialed Digits
Digits Evaluated By
System To Find Line
Group
2
67
067
3
118
118
4
5123
512
7
9782200
978
8
19782200
978
10
8049782200
804, 978
11
18049782200
804, 978
The example below shows how calls to area code 202 are routed using line group 2, calls
to office code 202 are routed using line group 1, calls to office code 973 in area code 716
are routed using line group 4, and all other calls are routed using line group 1.
Routing Calls Through Different Line Groups
Special Tables For Selected Area Codes
(Each table is for office code entries in a specific area code.)
Entries
000–999
Office
Code Table
Area Code
Table
Area Code 1
(716)
Area Code 2
(
)
Area Code 3
(
)
Area Code 4
(
)
000
1
1
001
1
1
002
1
1
202
1
2
1
212
1
1
1
973
1
4
997
1
1
998
1
1
999
1
1
The programmer can arrange for the system to insert up to eight digits (including * and #
as well as 0–9) ahead of a dialed number for a selected line group. Further, the
programmer can enter a pause of system-determined length as a character in the digit
string.
To help understand this digit insertion, review this typical arrangement for transparent
CENTREX operation (This example assumes that the CENTREX extensions do not
conflict with the office codes.): With the digital telephone system installed behind a
CENTREX system, callers can make outgoing calls without having to dial 9. Assume
DSU II Digital Telephone System
IMI66–132
Digital Telephone System Features A – 61
Содержание DSU II
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