ATT System 25 Reference Manual

Features and Services
An FRL is typically lower for the first route in a subpattern and increases with each additional route
in the pattern. A terminal’s FRL must be equal to or greater than the route FRL for the route to be
selected. The system first checks the Route #1 for an available trunk on which to route the call. If
the route is busy, Route #2 is checked, then Route #3, if required. If all routes in the subpattern are
busy and the CO overflow flag is set, the voice terminal FRL is checked against...

Automatic Route Selection (ARS)
l Area Code (NAA) Routing Table: Entries may include every North American NAA and
Special Number NAA, each with an associated ARS Routing Pattern. All NAAs existing
before 1995 are assigned Routing Pattern #1 by default. As new NAAs are created, they
have to be assigned routing patterns.
l Other Area Code Exception List: One List with up to 512 eight-digit numbers. Each entry
has an associated ARS Routing Pattern.
l Digit Translations Tables: One per trunk group.
A system...

Features and Services
l
l
ARS:
l
l
l
l
l
l
l
l
l
Specify whether “Dial 1” is needed for toll calls within your area code. (This requirement is
ignored for the 10-digit dial plan.)
Specify current dial plan, i.e., pre-interexchangeable area codes, interexchangeable area
codes, or 10-digit number plans.
ARS Access Code (1-9999; default = 9)
International ARS Routing Pattern Number (1-8; no default)
Three Emergency Numbers (7-digit numbers; no default)
NAA Routing Table (NAA code and associated pattern...

Automatic Route Selection (ARS)
— Subpattern A Start and End Time (Hour:Minute).
— Subpattern A and B—Route 1, 2, and 3 Facility Access Codes (1-9999) or
Virtual Facility Codes (#190-#199).
— Subpattern A and B—Route 1, 2, and 3 FRLs (0-3).
— Subpattern A and B Overflows to CO facility (yes or no).
— Subpattern A and B Overflow FRL (0-3).
Terminal Port:
l ARS FRL Level (0-3).
2-63 

FEATURES AND SERVICES
STATION USER
DIALS ARS
ACCESS COOE
[401]
NUMBER DIALED
ON EMERGENCY
NUMBERS LIST
(911, AND
THREE CUSTOMER
DEFINED 7-DIGIT
NUMBERS
[601-603]
VOICE TERMINALS“RESTRICT
OUTWARD
CALLS” = YES
NO
STATIONS[13]
YES
VOICE TERMINAL
ASSIGNED TOLL
RESTRICTIONCLASS 1-4NO
STATIONS[14]
NO
NUMBER DIALED
INTERNATIONAL,
OPERATOR, OR
OTHEROTHER
(SHEET 2)
YES
CALL ROUTED
VIA LOCAL
CO FACILITYCALLING USER
RECEIVES SYSTEM
REORDER TONE
YES
NUMBER DIALED ON TOLL CALL
ALLOWED LIST? 64 CODES MAY
BE DIVIDED...

Automatic Route Selection (ARS)
FROMSHEET 1
NUMBER DIALED
WITHIN HOME
NPA?
SYSTEM [30]NUMBER DIALED
OUTSIDE HOME
NOON FNPA
NOEXCEPTIONYESCALL ROUTED
NPA (FNPA)
LISTVIA ASSOCIATED
ROUTING PATTERN
YES[800]
NO
YES
CALL ROUTED
VIA LOCALCO FACILITY
NO
YESCALL ROUTED
VIA ASSOCIATEDAREA CODE ON
NPA ROUTING
TABLE [300]ROUTING PATTERN
SPECIAL N11
SERVICE CODE
DIALED
[900]
NOYES
CODE HAS AN
ASSIGNED
ROUTING
PATTERN
[901]
NO
CALL ROUTEDYESVIA ASSOCIATED
ROUTING
PATTERN
NUMBER DIALED
ON HOME NPA
EXCEPTION
LISTS...

FEATURES AND SERVICES
ROUTING SUBPATTERNS (RSP) A AND B
RSP AROUTE 1ROUTE 2
ROUTE 3
START/POOLEDPOOLED
POOLED
CO
STOPFACILITYFACILITY
FACILITY
OVERFLOWTIMEACCESSACCESS
ACCESSFLAGROUTINGCODE[101],CODECODE
PATTERNS
[l02](1-8)[110][120][130][140]
FRL (0-3)FRL (0-3)FRL (0-3)FRL (0-3)[100][111][121][131][141]
ROUTE 1
ROUTE 2ROUTE 3
POOLEDPOOLEDPOOLED
COFACILITYFACILITYFACILITY
OVERFLOW
ACCESSACCESSACCESSFLAG
CODECODECODE
RSP B
[210][220][230][240]
FRL (0-3)FRL (0-3)
FRL (0-3)FRL...

Bridging of System Access Buttons
Bridging of System Access Buttons
Description
This feature allows a multiline station user to handle calls on Bridged Access (BA) buttons
associated with System Access (SA) buttons of another multiline station (Figure 2-10).
The following terms are used throughout this feature description:
l   Principal station—
a multiline voice terminal that has SA buttons bridged by one or
more other multiline stations.
l   Principal—the user of a principal station.
l   BA button—a...

FEATURES AND SERVICES
The user active on a BA button can use many features with the bridged call; operation is no
different from calls on other buttons. For example, Hold, Conference, and Transfer can be
used from a BA button just as they would be used from a SA button. Calling restrictions
applied to calls made on bridged appearances are those of the bridging station, not those of
the principal station.
System 25 has the following bridging capacities and limitations:
l   The number of principal stations...

Bridging of System Access Buttons
status LEDs of the SA button and the bridged appearances light steadily. If neither principal
nor bridging user answers, the call goes to the principal’s coverage—if provided—in the
usual way. When the covering station answers, the status LEDs at the principal and bridging
stations light.
When a call comes into an idle SA button of a principal who is busy on another SA button,
the bridging station(s) will receive flashing (and ringing, if administered) on the bridged...