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 an associated
Overflow FRL before routing the call.
If all routes in a subpattern are busy and the CO Overflow flag is not set, or all CO trunks are busy,
the call returns to the first route in the subpattern and may be queued (if the station FRL permits
access to the first route) via the Callback Queuing feature. A route #1 must be specified in the
subpattern for a call to queue. If it is not, callers receive Reorder Tone and will not be able to
queue.
Once a route has been selected, the entries in a Digit Translations Table associated with the
selected route’s trunk group or Virtual Facility is checked. Based on an associated NAA and the
NAA dialed, the system can remove up to 10 digits and then add a pattern of up to 5 digits as
specified to route the call.
The following tones are associated with ARS:
l Confirmation—Indicates that a queued call is being serviced (trunk available to route call)
l Busy—Indicates that the called number is busy
l Reorder—Indicates that all trunks are busy or that ARS calling is denied
Considerations
With ARS, users do not have to worry about accessing a particular pooled facility to place a long
distance call. The user simply dials the ARS access code and the desired number. The system then
routes the call via the facility best suited for that call.
The following provides a summary of the ARS call routing controls provided by the feature:
l Emergency Numbers List: 911 and up to three customer-defined, 7-digit numbers.
l Service Codes (W11 Numbers): An ARS Routing Pattern can be assigned to each W11
(W = 0-9) Service Code. If no routing pattern is assigned, the system assumes that the
W11 number is a local CO code and will wait for four additional digits to be dialed before
processing it as a local call.
l Toll Call Allowed/Disallowed Lists: 1-5 lists, 164 entries maximum of 3-digit numbers
between all lists. Entries examined by ARS may be 3-digit CO codes or 6-digit NAA plus
CO codes. International dial codes entered in the Toll Allowed List are treated as
DISALLOWED entries rather than ALLOWED entries. The international entries have the
form “0ABCDE” (6 digits always with a leading zero), where ABCDE can be any digit
ranging from (0-9 or “.”,which is a wild card. If 0 + 5 dots are entered in a Toll Disallowed
List, the station(s) assigned to the class cannot make international calls. (Administrable for
users besides ARS.)
l Station Toll Restriction Class: 1-5 Classes (administrable for users besides ARS)
l Home Area Code (HNAA) Exception List: 1-4 Lists, each with an associated ARS
Routing Pattern. Eight hundred 3-digit CO codes entries maximum between all lists (eight
of the entries maybe 7-digit numbers.)
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							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 can have up to eight ARS Routing Patterns assigned. Each pattern can contain up to six
routes (three per subpattern).
Interactions
The following features interact with Automatic Route Selection.
Bridging of System Access Buttons: When a station user originates a call on a Bridged Access
button and dials the ARS code, the call is completed according to the restrictions assigned to that
station, not the principal station.
Callback Queuing: Implementation of Callback Queuing affects ARS in three respects:
l On-hook ARS queuing is allowed.
l Callback Queuing and ARS share a common queue, which has a capacity of 64 calls.
l When a station without automatic queuing originates an ARS call, the caller hears reorder
tone if all routes are busy; the call can then be queued manually.
Calling Restrictions: Outward Restriction and Toll Restriction, when administered, prevent calls
from routing via ARS in a manner similar to directly accessing a trunk or pool. Pooled facility
access restrictions do not apply. In fact, the recommended arrangement to ensure that users make
maximum use of ARS is to block dial access to most trunk groups, so that users must dial the ARS
access code to place calls.
Direct Facility Access Button: Multiline voice terminal users who have pressed FACILITY to
activate the busy-to-idle reminder must wait until all queued ARS users have been serviced.
Interexchange Carrier (IXC): Calls cannot be dialed via ARS from any station.
Tie Trunks: Immediate Dial tie trunks should not be used in ARS routing patterns.
Virtual Facilities: Virtual Facilities may be used in place of trunk groups in ARS routing patterns.
When used with ARS, a digit translation scheme may be associated with each virtual facility. See
the “Virtual Facilities” feature description for more information.
Administration Requirements
System:
l Specify your area code (HNPA).
l Specify whether “Dial 1” is needed for calls outside of your area code. (This requirement is
ignored for the 10-digit dial plan.)
November 19952-61 
						

							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 number 1-8; default= 1)
X11 Routing Table (X11 code and associated routing number 1-8 or 0 if this code is a valid
CO exchange requiring four additional digits to complete; no default).
HNAA Exception List:
— List Number (1-4)
— Pattern Number (1-8)
— Exception Numbers (NXX or NXX-YYYY). Last three digits maybe “.”
FNPA Exception Telephone List (Other Area Code exception list):
— Pattern Number (1-8)
— Telephone Number (8-digits in the form NAA-NXX-YY; last two digits maybe “.”)
Digit Translations Table:
— Trunk Group Facility Access Codes (1-9999) or Virtual Facility Codes (#190-#199)
— Associated NAA (Area Code)
— Number of digits to remove for calls within associated NAA (1-10 digits, none)
— Digit pattern to add for calls within associated NAA (maximum of 5 digits; default =
none)
— Number of digits to remove for calls not in associated NAA (1-10, none; default =
none)
— Digit pattern to add for calls not in associated NAA (maximum of 5 digits; default =
none)
ARS Routing Pattern:
— Pattern Number (1-8)
2-62November 1995
— 
						

							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).
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							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 INTO 4 LISTS OF
ANY LENGTH
TOLL ALLOWED[1-3]
OPERATOR
YES
INTERNATIONALNO
STATION USERRECEIVES SYSTEMREORDER TONEROUTE CALL
VIA LOCAL
CO FACILITY
ROUTE CALLVIAINTERNATIONAL
ROUTING
PATTERN
[402]
Figure 2-8.Automatic Route Selection Flow Chart (Sheet 1 of 2)
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							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
[500]
YES
HOME AREA CODENOYESCALL ROUTED
ON NPA ROUTING
VIA ASSOCIATED
TABLE [300]
ROUTING PATTERN
NO
CALL ROUTEDVIAASSOCIATED
ROUTING
CALL ROUTEDVIA LOCALCO FACILITY
Figure 2-8.
Automatic Route Selection Flow Chart (Sheet 2 of 2)
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							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 (0-3)[200][211][221][221][241]
NO
YES
QUEUEONROUTE 1
ROUTE
SELECTED
DIGIT TRANSLATIONS
TABLE ASSOCIATED
WITH POOLED FACILITY
OR VIRTUAL FACILITY.
DELETE DIGITS (0-10)
ADD DIGITS (MAX 5)
[700S]
ALL ROUTES
BUSY
ROUTE CALL
VIA DDD
NETWORK
Figure 2-9.Automatic Route Selection Routing Pattern
2-66 
						

							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 special call appearance button on a multiline station administered to
correspond to a specific SA button on another user’s station (the principal station);
collectively referred to as bridged appearances.
l   Bridging station—a multiline voice terminal with one or more BA buttons.
A BA button can be assigned to any programmable feature button on a bridging station, but
it does not take the place of a SA button. The SA buttons on the bridging station can be
bridged by other stations.
PRINCIPAL STATIONBRIDGING STATION
Figure 2-10.Typical Bridging Arrangement
A bridging station user is able to originate calls from BA buttons and can answer calls for the
principal. The bridging user can also enter existing calls on bridged appearances by simply
going off-hook on the BA button, unless Exclusion has been activated or the maximum of
five active parties on a call has been reached.
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							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 is limited only by the number of multiline sets on the
system.
l   The number of SA buttons a principal station can have is limited only by the number
of available buttons on the terminal.
l   Each SA button on a principal station can have a bridged call appearance on up to
16 multiline voice terminals.
l   The number of principals for which a station has bridged call appearances is limited
only by the number of available programmable buttons.
l   The maximum number of parties active on a bridged call is five (no more than two of
these may be outside parties).
Incoming calls ring the principal station and its bridging stations according to ring options
specified by the System Administrator.The principal station can be administered to send, or
not send, ringing to the bridging station;both stations can be administered to receive
immediate ring, delayed ring, or no ring for incoming calls.Table 2-F summarizes the effect
of different settings for these ring options.
Table 2-F.
Bridged Ringing Options
Bridging Station
Principal Station
No Ring
Immediate RingDelayed Ring
AdministeredAdministeredAdministered
Administered to sendyesno ringimmediate ringdelayed ring
ring on no answer?
nono ringno ring*no ring*
Administered to send
yesno ringimmediate ringdelayed ring
ring on busy?
nono ringno ring*no ring*
* When Send All Calls is enabled at the principal station, immediate
ringing occurs in these situations.
As with standard System 25 operation, off-hook stations receive abbreviated alerting instead
of repeated ringing. In addition, ring options have no effect on visual alerting via status LEDs
on SA or BA buttons.
When an inside or outside call comes into a SA button of an idle principal station, it and each
bridging station receive ringing, according to options set by the System Administrator, and
visual alerting with a flashing status LED.If one of the users picks up the call, the green
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							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
appearance of the called button. A bridging station can answer the call.
A call to a principal with all SA buttons busy will receive busy tone unless coverage is
available or Call Waiting is administered. Bridging stations do not have access to the call.
Considerations
The bridging feature meets the needs of executive/secretary type arrangements where both
parties place and receive calls on the same extension numbers. Bridging allows more
complete coverage of all incoming calls.It provides options that can enable several call-
answering patterns.
It is recommended that each SA button at a principal station have a corresponding BA button
at the bridging station.With this arrangement, the bridging user can track all calls coming to
the principal’s SA buttons.
Except for their bridging functions,bridging stations operate independently of their
associated principal stations.
The bridging feature applies only to calls appearing on the SA buttons of a principal station.
Calls on Automatic Intercom, Personal Line, DSS, and Flex DSS buttons are not accessible
from a BA button.
Interactions
The following features interact with Bridging.
Abbreviated Ringing: When a call arrives on an SA button of the principal, off-hook
stations—principal and bridging—that have bridged ringing enabled receive abbreviated
ringing. The green status LEDs of the SA button and the BA button associated with the
incoming call continue to flash after the abbreviated ring.
Account Code Entry: A station user can use the Optional Account Code Entry feature for
incoming or outgoing calls on bridged appearances. If a bridging station user has the Forced
Account Code Entry (FACE) feature, an account code must be entered for all applicable
outgoing calls on both SA and BA buttons.
Attendant Positions: Direct Trunk Attendant Consoles cannot serve as principal stations.
Switched Loop Attendant Consoles cannot serve as either principal or bridging stations.
2-69