TO ORDER COPIES OF THIS DOCUMENT REFER TO DOCUMENT NUMBER 555-530-200
Contact:
In Canada call: 800-255-1242
Write:
Every effort was made to ensure that the information in this document was complete and
accurate at the time of printing.
document will be reissued periodically to incorporate changes.
Your AT&T sales representative, or
Call: 800-432-6600, Monday through Friday between 7:30 am
and 6:00 pm EST, or
AT&T Customer Information Center
2855 North Franklin Road
P.O. Box 19901
Indianapolis, Indiana 42619
However, this information is subject to change. This
R2V1 Reference Manual
Prepared by System 25
Document Development Group and the
AT&T Documentation
Management Organization
FCC NOTIFICATION AND REPAIR INFORMATION
AT&T SYSTEM 25
This telephone equipment is registered with the Federal Communications
in accordance with Part 68 of its Rules. In compliance with the Rules,
following:
MEANS OF CONNECTION
Connection of this telephone equipment to the nationwide telecommunications network shall
be through a standard network interface USOC RJ21X jack. Connection to private line
network channels requires USOC RJ2GX jack for tie lines or USOC RJ21X jack for offpremises station lines. These can be ordered from your telephone company.
NOTIFICATION TO THE TELEPHONE COMPANY
If the system is to be connected to off-premises stations (OPSs), you must notify the
telephone company of the OPS class of service, OL13C, and the service order code, 9.0F.
Upon the request of the telephone company, inform them of the following:
—
The Public Switched Network “lines” and the Private “lines” to which you will
connect the telephone equipment.
—
The telephone equipment’s “registration number” and “ringer equivalence number”
(REN) from the label on the equipment.
Commission (FCC)
be advised of the
—
For private line connections, provide the facility interface code, TL31M for tie lines.
You must also specify the service order code, 9.0F.
—
The quantities and USOC numbers of the jacks required.
—
For each jack, provide the sequence in which lines are to be connected; the type
lines and the facility interface code and the ringer equivalence number by position,
when applicable.
This telephone equipment should not be used on coin telephone lines. Connection to party
line service is subject to state tariffs.
REPAIR INSTRUCTIONS
If you experience trouble with this telephone equipment, contact the AT&T National Service
Assistance Center on 1-800-628-2888. The telephone company may ask that you disconnect
this equipment from the network until the problem has been corrected or until you are sure
that this equipment is not malfunctioning.
RIGHTS OF THE TELEPHONE COMPANY
If your telephone equipment causes harm to the telephone network, the telephone company
may discontinue your service temporarily.
If possible, they will notify you in advance. But if
advance notice isn’t practical, you will be notified as soon as possible. You will be informed
of your right to file a complaint with the FCC.
Your telephone company may make changes in its facilities, equipment, operations, or
procedures that could affect the proper functioning of your equipment. If they do, you will be
notified in advance to give you an opportunity to maintain uninterrupted telephone service.
HEARING AID COMPATIBILITY
The voice terminals described in this manual are compatible with inductively coupled hearing
aids as prescribed by the FCC.
Federal Communications Commission (FCC) Rules require that you be notified of the
following:
● This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause interference to
radio communications.
● It has been tested and found to comply with the limits for a Class A computing device
pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable
protection against such interference when operated in a commercial environment.
● Operation of this equipment in a residential area is likely to cause interference in which
case the user at his or her own expense will be required to take whatever measures may
be required to correct the interference.
DANGER
The AT&T System 25 cabinets are not user serviceable.
Some voltages inside the cabinets are hazardous. This
equipment is to be serviced only by qualified technicians.
CONTENTS
Section 1—Overview
Section 2—Features and Services
Section 3—Functional Description
Section 4—Hardware Description
Section 5—Technical Specifications
Section 6—Environmental Requirements
Section 7—Parts Information
Incoming Business Communications
Outgoing Business Communications
Internal Call Movement
Data Communications
Growth & Rearrangement
Conclusions
1-1
1-1
1-1
1-4
1-4
1-5
1-5
1-7
1-9
1-10
1-13
1-15
-i-
Figures
Figure 1-1.System 25 Block Diagram
1-2
-ii-
OVERVIEW
OVERVIEW
Introduction
This reference manual provides general technical information on AT&T System 25 (System
25). It includes a description of the system, its hardware and software, features and
services, environmental requirements, and technical specifications. This manual is intended
to serve as an overall technical reference for System 25.
This manual is released specifically to cover Release 2 Version 1 (R2V1) of System 25. It
does not contain information that applies only to the earlier releases of System 25.
Organization
This manual is divided into 10 sections. The remaining sections are as follows:
● SECTION 2—FEATURES AND SERVICES
● SECTION 3—FUNCTIONAL DESCRIPTION
● SECTION 4—HARDWARE DESCRIPTION
● SECTION 5—TECHNICAL SPECIFICATIONS
● SECTION 6—ENVIRONMENTAL REQUIREMENTS
● SECTION 7—PARTS INFORMATION
● SECTION 8—REFERENCE DOCUMENTATION
● SECTION 9—GLOSSARY
● SECTION 10—INDEX.
System 25 Description
System 25 is an advanced digital switching system that integrates voice and data
communications. (See block diagram in Figure 1-1.) It not only provides the features of a
state-of-the-art Private Branch Exchange (PBX), but goes a step further by allowing data to
be switched point-to-point without first being converted to analog format. This capability can
be used to set up connections between data terminals, word processors, personal
computers, and host computers.
distributed network processor elements to provide (essentially) nonblocking voice and data
switching.
System 25 uses intelligent port circuits equipped with
1-1
OVERVIEW
CALL ACCOUNTING
SOFTWARE OR
SMDR PRINTER
SYSTEM ADMINISTRATION
TERMINAL OR
MS-DOS PC WITH
ADVANCED
ADMINISTRATION
DIGITAL TAPE UNIT OR
MS-DOS PC WITH
ADVANCED
ADMINISTRATION
TRUNK FACILITIES
● DID
● FX
● TIE
● WATS
● CO
● AUXILIARY-DICTATION
PAGING
EQUIP
SINGLE-LINE
VOICE TERMINAL
MULTILINE
VOICE TERMINAL
DIRECT TRUNK
ATTENDANT
CONSOLE OR
SWITCHED LOOP
ATTENDANT CONSOLE
RS232
RS232
RS232
ANALOG
ANALOG
HYBRID
HYBRID
CONTROL
COMPLEX
SWITCHING
NETWORK
INTEGRATED SOLUTION
RS232
●
ADVANCED ADMINISTRATION
●
CALL ACCOUNTING SOFTWARE
●
OFFICE AUTOMATION SOFTWARE
●
VOICE MESSAGE SYSTEM WITH
- AUTOMATED ATTENDANT SERVICE
- CALL COVERAGE SERVICE
- VOICE MAIL SERVICE
- ANNOUNCEMENT SERVICE
ANALOG
- MESSAGE DROP SERVICE
STATION
DATA
ASYNCHRONOUS
DATA UNIT
ANALOG
MODEM
STARLAN NETWORK
GATEWAY
RS232
HOST COMPUTERS
TERMINALS
PRINTERS
RS232
MODEMS
DIGITAL DEVICES
STARLAN NETWORK
WORKSTATIONS
STARLAN NETWORK
PRINT AND
FILE SERVERS
STARLAN NETWORK
HOSTS
●
MUSIC SOURCE
●
EXTERNAL ALERT
●
RECORDED
ANNOUNCEMENT
● DICTATION
EQUIPMENT
1-2
RIMS
ACCESS
ANALOG
ANALOG
TRUNK
Figure 1-1.
HYBRID
WITH CALL
MANAGEMENT
SYSTEM
System 25 Block Diagram
MS-DOS PC
OVERVIEW
Voice communications features combine traditional telephone features, such as Transfer and
Hold, with advanced features, such as Individual and Group Coverage, Hands-Free Answer
On Intercom, and Speed Dialing (see Section 2, “Features and Services”).
Data communications features provide switched data connections supporting transmission of
voice and data over Premises Distribution System wiring.
Data connections can be made
between two digital data modules (asynchronous data units), between two analog modems,
or between an analog modem and a digital data module. System 25 also provides access to
STARLAN NETWORKs (Release 2 of STARLAN only). The system has data modules that
provide an RS-232 interface for full duplex, asynchronous, transmission of data up to 19,200
bps, and an integrated 212A-compatible modem pool resource.
System 25’s Integrated Solution offers customers a unique package of integrated call
management,switch management, and office automation applications.
The Integrated
Solution is a set of application programs that run on a Master Controller (UNIX® PC). The
applications include Advanced Administration Software (AAS), which permits customers to
administer System 25’s features themselves;
Call Accounting System (CAS); and an
integrated Voice Message System (VMS) that provides call coverage, leave word calling,
automated attendant, and voice mail services.In addition, a number of generic office
automation applications (word processing, data base management, and spreadsheet) are
also available for the Integrated Solution; these applications may be run simultaneously with
the VMS and CAS applications.
System 25 supports the following:
● Trunk and Network Facilities—
Signaling on incoming and outgoing trunks (dial pulse only on DID trunks).
— Loop Start (LS)
— Ground Start (GS) (Strongly Preferred over Loop Start in most installations)
— Tie Trunks (Type I and Type I Compatible E&M, Type V Simplex)
— Direct Inward Dialing (DID)
● Voice Terminals —
Single-Line Touch-Tone, Single-Line Rotary, MET, and 7300H
Series Multiline Sets from the MERLIN® Communications System.
● Data Facilities
— Digital Data End Points — RS-232 Interfaces via Asynchronous Data Units
— Analog Data End Points —
— STARLAN NETWORK Access (Release 2 of STARLAN only).
Dual Tone Multifrequency (DTMF) and Dial Pulse
Tip/Ring-Type Modem Interfaces
1-3
OVERVIEW
● Networking Capability
— Remote Access
— Tie Trunks
— Tandem Trunking
— Endpoint in Electronic Tandem Network (Tributary only, not Satellite)
— Endpoint of Enhanced Private Switched Communications Services (EPSCS)
— Endpoint of Tandem Tie Trunk Network (TTTN)
— Endpoint of Common Control Switching Arrangement (CCSA).
Call Handling Capabilities
System 25 can be arranged as a stand-alone system or can be part of a private network.
The system provides 256 ports to support the following:
● 115 simultaneous two-party conversations
● Traffic Handling Capacity of 4140 CCS (Trunking Limited)
● Up to 104 trunk ports including Central Office (CO), DID, Tie, Foreign Exchange (FX),
Wide Area Telecommunications Service (WATS), and 800 Service
● An Auxiliary Trunk interface for paging and dictation systems
● Up to 240 ports that support a combination of the following:
— Up to 200 ports for voice terminals and auxiliary feature port equipment.
— Up to 104 data ports providing RS-232 connections to data terminals,
personal or multiport computers.
Refer to Hardware and Software Parameters as provided in ''Technical Specifications”
(Section 5) for detailed specifications.
Safety
System 25 meets all requirements found in Underwriters Laboratories Standard for
Telephone Equipment (1459).
1-4
OVERVIEW
Business Communications Needs
The remainder of this section describes how System 25’s features may be used to satisfy a
customer’s communications needs. This material may be thought of as the reverse of the
“Features and Services” in Section 2.
The business communications capabilities of the majority of small businesses with more than
30 phones are provided by a PBX. System 25 is a PBX designed to meet the business
communications needs of customers in the 30 to 150 station range.
The communications needs of most business customers may be broken down into five basic
categories. Customer experience has shown that a PBX needs to provide—
● Prompt handling of incoming calls to maximize revenue opportunities and client
satisfaction,
● Ease of access to and cost control of outgoing calls over public network and private
facilities,
● Easy movement of calls between on-premises phones and between on-premises and
off-premises phones,
● Sharing of data between PCs and/or host computers and data terminals, and
● Growth and rearrangement of facilities.
The following pages outline System 25’s outstanding ability to provide these services.
Incoming Business Communications
Successful call termination is the key to capturing all incoming communications associated
with revenue issues, client inquiries, decision data, etc. Call termination involves identifying
the called party and routing the call to a primary or secondary answering position. System
25 provides powerful tools for both call screening and call termination.
● Attendant Consoles allow one or two attendants to answer, screen, and steer
incoming calls using either Direct Trunk or Switched Loop operation. With attendant
operation, incoming calls can be screened and extended to the appropriate party for
resolution or forwarded to alternate locations, and messages can be taken for absent
clients. Calls may arrive over any of the network facilities described in later sections
of these notes.
● System 25’s Integrated Solution can provide Automated Attendant service, either
reducing the volume of calls your attendant needs to handle or providing off-hour
attendant service.
1-5
OVERVIEW
● Direct Inward Dialing allows incoming callers to reach specific individuals or facilities
without attendant assistance.
This allows specific numbers to be advertised for
direct customer access to brokers, emergency services, etc., over a shared pool of
DID trunks.
● The Call Management System provides Automatic Call Distribution (ACD) service and
associated call traffic and agent performance reports.
● Direct Group Calling (DGC) allows incoming calls to be directed to a specific group of
stations. Calls to a DGC group hunt for an idle station in a circular manner, starting
at the station following the last one called. If all group members are busy, calls are
queued and can be sent to a delay announcement. A DGC group can terminate calls
to sales, services, computer, announcement, etc., over either ordinary CO trunks or
DID trunks.
● Personal Lines provide dedicated outside lines for multiline voice terminal users and
are accessed via a dedicated button for both incoming and outgoing service. Up to
16 terminals may share a Personal Line with up to 4 parties simultaneously off-hook.
A personal line provides direct access to brokers, emergency service, etc., over a
dedicated loop start or ground start trunk.
● Call Waiting lets users know that they have another incoming call and helps avoid
missing important calls.
● Remote Access allows employees to use the services and facilities of System 25
from home or when they are on the road.Barrier codes prevent unauthorized
access.
Frequently, the called party is not available to handle an incoming call. System 25 provides a
number of methods for redirecting incoming calls to alternate resources.
● Coverage allows calls that are not answered within a specified number of rings to be
redirected to an individual covering station and/or a group of covering stations. This
is especially useful for Boss-Secretary arrangements, staff backup, and message
service.
This feature is versatile enough to permit suitable alternate answering
arrangements for virtually every level of employee. Special features, such as the
Send All Calls feature which routes a user’s calls directly to covering station(s),
accommodate the day-to-day variations that occur in an employee’s work schedule.
● Following and Forwarding allow users who are away from their normal locations to
receive their calls at other phones inside the system or (Forwarding only) outside the
system.This feature supports roving personnel and shared office space for
company staff.
● The Integrated Solution can provide call coverage service, along with integrated voice
mail and Leave Word Calling.
● The Bridging feature permits calls on a user’s System Access buttons to be
answered at another station on Bridged Access buttons.
1-6
OVERVIEW
● Station Hunting provides automatic redirection of incoming calls to an idle member of
a hunt group when the called party is busy.
● Pickup allows a user to answer a call ringing at another terminal. Directed Pickup
allows a user to answer a call ringing at any terminal by dialing the pickup code and
the Personal Dial Code (PDC) of the ringing station. Group Pickup permits calls to
any other terminal in the pickup group to be answered by dialing the group call
pickup code. With Pickup, users do not have to leave their phone to answer other’s
calls. This feature is especially useful for local coverage in group offices not
supported by secretarial service and equipped with economical single-line phones.
When alternate resources are not available to handle an incoming call, System 25 provides
for attendant handling of the call utilizing camp-on, redirection, and/or message service.
● Camp-On allows the attendant to extend an outside call to a busy station. A burst of
tone is heard at the called station to notify the user of the camped-on call. The caller
is placed on hold and hears music-on-hold, if available. When the user hangs up, the
camped-on call begins ringing immediately. The Return Coverage on Busy feature
returns unanswered camped-on calls to the attendant for service after a specified
interval.
● Return Coverage on Don’t Answer returns unanswered attendant-extended calls for
additional service (redirection/messaging).
● Messaging Service supports activation of a light-emitting diode (LED) at the called
station to indicate that the attendant, message desk, or another station has a
message for the user.
Special arrangements are needed to handle incoming calls during periods when the normal
staff is not available, for example, at night and on weekends. System 25’s Night Service
feature allows on-duty personnel to answer incoming attendant-seeking calls when the
attendant is not on duty. Directed Night Service redirects incoming attendant-seeking calls to
designated voice terminals, such as a guard desk or coverage position. Trunk-AnswerFrom-Any-Station (TAAS) Night Service allows users to answer incoming calls from any
station by dialing the Night Service access code. Night personnel can be alerted by a night
bell.
Outgoing Business Communications
One of the key functions of a customer premises communications system is to provide easy
access to the most cost effective network facilities for outgoing calls. The system needs to
be capable of steering calls based on cost, and must also keep records of incoming and
outgoing calls and associated costs.
Building on its ground start trunk capability, System 25
features control costs and record usage as follows.
● Call Restrictions allow the manager to restrict users from making certain types of
calls. Restriction is administered through outward restriction, toll call restriction, and
facility access restriction.
1-7
OVERVIEW
● Automatic Route Selection provides manager defined routing of calls over the
telecommunications network based on preferred routes (normally the least expensive
route available at the time the call is placed) with capacity for multiple common
carriers and routing through tandem switch points.
The user dials a standard Direct
Distance Dialing (DDD) number and the system selects the call route.
● Station Message Detail Recording (SMDR) generates detailed call information on all
incoming and outgoing calls and sends this information to an output device (PC or
printer).
● Call Accounting Systems provide multiple types of customer reports on
communication costs and usage.
● Account Code Entry allows a user to associate calls with an account code for
charge-back purposes. This feature can be administrated (on a per-station basis) to
force the entry of the required codes before outgoing calls can be made.
Ease of access to multiple types of network facilities (provided for minimum cost) is managed
by the following features.
● Automatic Route Selection (ARS) allows the customer to dial a standard DDD
number. ARS selects the preferred route and does any number conversions required
for the facilities selected.
● System 25’s Virtual Facility feature provides convenient and inexpensive access to
Other Common Carriers (OCCs). This feature provides access to OCC facilities over
a user specified physical facility; dedicated OCC trunks are not needed. Local OCC
access numbers and account codes are automatically added by System 25. System
25’s Virtual Facility feature is fully integrated with its ARS, Toll Restriction, and
SMDR/CAS features.
● Callback Queuing provides a simple way to complete calls to busy trunk pools
without having to manually repeat the calling procedures. Such calls are put into a
queue; when the busy facility is available, the originator is alerted and the call is
completed.
● Last Number Dialed automatically saves the last number dialed and allows the user
to retry the number without redialing (multiline voice terminals only).
● Callback Queuing puts a call made to a busy facility into a queue, notifies the calling
user when the facility becomes available to receive the call, and completes the call.
● Repertory Dialing allows multiline voice terminal users to store a telephone number
or account and associate that number with a button on their voice terminal. Pressing
a Repertory Dialing button is equivalent to dialing the stored number (one-touch
dialing).
● System Speed Dialing allows all users to dial 90 selected numbers using 3-digit
codes. Users can also program up to 20 Personal Speed Dialing Numbers, which
are accessible only from their terminals. System Speed Dialing can be used by the
system administrator to hide business account codes from users.
1-8
OVERVIEW
● Pooled Facility-Dial/Direct Access allows both multiline and single-line voice terminal
users to access a common pool of trunks for outgoing calls by dialing a facility
access code, or, on multiline voice terminals, by pressing a button. This grouping
provides resource pooling, which results in better service with a given number of
trunks.
● Personal Lines provide dedicated outside lines for multiline voice terminal users.
Personal lines are accessed via a dedicated feature button. Up to 16 terminals may
share a personal line.
● Third-Party Call Setup allows PCs to set up calls between a System 25 voice/data
terminal and any other facility. A PC application program could use this capability to
retrieve information from a data base.
Last Number Dialed, Repertory Dialing, and Speed Dialing are also applicable to dialing and
managing internal calls. Personal lines provide both incoming and outgoing service.
Internal Call Movement
Typically, about 40 percent of PBX calls are internal calls, call transfers to another location,
conference of multiple locations, temporarily suspended calls, page to locate the called party,
etc. Rapid placement of internal calls and easy call movement from the answering station to
a new station are supported with numerous features in System 25.
To provide easy internal call setup, System 25 provides the following
● Direct Station Selection (DSS) allows one-button access
terminal to another voice terminal, a pooled facility, paging zone, or DGC group. The
DSS status LED reflects the idle/busy status of the associated termination point.
This feature is used to track and contact frequently called associates.
● Automatic Intercom allows multiline voice terminal users to call each other by use of
a dedicated line appearance. A private dedicated path ensures that a path is always
available. This feature is frequently used in Boss/Secretary arrangements.
● The Dial Plan for System 25 is based on the concept that, whenever possible, calls
should be placed to individuals rather than to pieces of equipment. To implement this
concept, individuals are assigned PDCs and are allowed to sign in those PDCs at
other terminals. The system automatically routes the call to the home terminal or
signed-into terminal. This significantly increases the probability of reaching the called
party. In addition, the Dial Plan is built on a flexible numbering scheme that allows
the number of dialed digits to match assigned PDCs (2/3/4 digit dial plans) and to be
administered to match telephone company assigned Direct Inward Dialing numbers.
features.
from a multiline voice
1-9
OVERVIEW
Efficient internal call termination is supported with the following features.
● Distinctive Ringing provides various patterns of ringing to allow users to distinguish
outside calls, inside calls, callbacks on queued calls, and calls set up at an
associated data terminal.
● Hands-Free Answer on Intercom (HFAI) allows Speakerphone and HFAI terminals to
auto-answer inside or attendant extended calls. With HFAI active, the set generates
a tone burst over its speaker to alert the calling and called party of the call
completion.Both parties may then converse;
no action by the called party is
required.
Frequently, the first termination point for a call is not its final destination. To support internal
call movement, System 25 provides the following features.
● Bridging of System Access and Personal Lines allows calls to be passed in a manner
that key system users are familiar with.
● Transfer allows a user to transfer any call to another voice terminal. This feature
supports transfer of calls from the answering position to another location for
completion of a transaction. Examples are secretary to boss, office to lab, broker to
specialist, etc.
● Conference allows up to five parties (maximum two outside), including the originator,
to participate in a call. This feature supports add-on of additional parties to a call for
joint consultation, crisis management, schedule coordination, etc.
● Hold allows a user to suspend a call. The Hold feature allows users to temporarily
disconnect from one conversation and either place or answer another call. Music or
information bulletins may be provided to the held party. Called parties frequently use
the hold period to access computer data bases, search categories, and/or consult
with others via a second phone call.
● Following and Forwarding provide users with ways to answer their incoming calls
while temporarily away from their home terminals.
● Park allows a user to place a call or conference on hold and then pick up the call
from any voice terminal. The user can page another party to pick up the parked call
or may move to another location and then re-access the call.
Data Communications
Small Business customers have started to integrate PCs into their day-to-day business
operations.
Businesses have found a need to access the data bases (sales, inventory,
personnel) in these PCs from more than one location (both on- and off-premises). System 25
data features are specially engineered to enhance a user’s ability to access data from
multiple locations.System 25 has been designed to help these businesses use their
personal computers, data terminals, and host computers more effectively by providing the
1-10
OVERVIEW
following features.
● Circuit switched data communications up to 19,200 bps (RS-232 interface) provide
circuit switched connections from asynchronous data terminals, PCs, or host
computers to host computers or network facilities. Users can be located and/or
moved to any on-premises office equipped with the standard AT&T 4-pair wiring plan.
Thus an asynchronous terminal or PC can have access to multiple host computers,
remote data bases via a modem pool, and a local area network (STARLAN) via
System 25’s STARLAN NETWORK gateway.
● Packet switched data connections at 1 million bps over AT&T’s STARLAN NETWORK
local area network provide data transfer between client PCs and servers (PCs/host
computers/printers, etc.) on the local area network (LAN). LAN users can be located
and/or moved to any on-premises office equipped with standard AT&T 4-pair wiring.
The LAN allows PCs to share facilities (printers, disk systems, modem pools, etc.).
● System 25’s STARLAN NETWORK ACCESS software and STARLAN NETWORK
gateway provide access to the STARLAN NETWORK for off-premises and occasional
on-premises users. These users do not need to install a Network Access Unit (NAU)
in their PCs to use the STARLAN NETWORK ACCESS software. The data transfer
rate is limited to 9600 bps or, for off-premises users, by the modem.
Note:
System 25 is compatible only with Release 2 of the STARLAN
NETWORK.
LAN users can access hosts connected to System 25, or, if their System 25 is
equipped with a modem pool, remote hosts.
Finally, terminals and PCs connected to
System 25 data ports can access host computers on the LAN.
Frequently a user needs to access a LAN data base at or from a remote location (home,
motel, client office, branch, etc.). To support out-of-building access to computer data over
network facilities or Off-Premise Station (OPS) lines, System 25 provides the following
features.
● Modem pooling allows data terminals to communicate over analog facilities utilizing
the standard dialing plan and provides full access to all network facilities, cost control
mechanisms, ARS, and incoming call management tools (DID/attendant/DGC, etc.).
● Transfer to data allows a data call to be set up on a voice terminal and then to be
transferred to a data terminal or computer, This feature can also be used to enter an
account code for the data call.
● The System 25 STARLAN NETWORK gateway allows the LAN environment to be
extended to occasional users or remote locations. Off-premises users can access
the LAN utilizing all the network features, cost control mechanisms, and incoming call
management facilities of System 25.The data transfer rate is governed by the
modem.
Setting up data communications with PCs, host computers, and/or remote access can be a
source of confusion for occasional users. The following special data features are provided
by System 25 to assist the user in utilizing its rich set of data communications capabilities.
1-11
OVERVIEW
● The integrated voice-data dialing plan recognizes the different types of data
endpoints (digital/ analog and remote/Iocal) in a connection and automatically inserts
the required data communication equipment.
In addition, autobauding supports the
alignment of equipment with the capacity to transmit at different data rates.
● Station Hunting supports the use of a single dial code to access a group of host
computer ports.
● Terminal Dialing provides the user with fast access to data communications via
keyboard dialing at a terminal or PC.
● Command Mode provides a menu of data services supporting terminal dialing and
display and control of user data port options.
A user friendly Change Options menu
is provided for user administration of data options.
● Expert Mode is an enhancement that provides an alternative method of accessing
Command Mode functions. It eliminates the display of menus and allows multiple
commands to be entered on a single line.
Expert mode is suitable for use with
computer-driven scripts for call setup.
● Communication Access Manager (CAM) is an MS-DOS* software application that
provides a phone manager for placing voice and data calls for the user and VT100†
terminal emulation.CAM may be used on either STARLAN NETWORK client
workstations or on PCs connected to System 25. CAM has a 200-entry directory
with one-touch dialing for both voice and data calls and auto-login capability for data
calls to host computers.
CAM’s Remote Access feature provides password
protected unattended access to PC files and electronic mail. File transfer is
supported with the popular XMODEM protocol.
● STARLAN NETWORK ACCESS is an MS-DOS software application that allows PCs
not connected to the STARLAN NETWORK to call through the System 25 STARLAN
NETWORK Interface and run STARLAN NETWORK client software to access file and
printer servers
on the STARLAN NETWORK. ACCESS uses a PC’s serial
communications port to communicate with the STAR LAN NETWORK Interface.
ACCESS is compatible with NETBIOS, permitting execution of most applications
written for the IBM‡ PC Network and IBM Token Ring Network.
Registered trademark of Microsoft Corp.
*
† Trademark of Digital Equipment Corp.
‡ Trademark of International Business Machines Corp.
1-12
OVERVIEW
Growth & Rearrangement
Historical data indicates that clients in the System 25 station range have a need for
communications systems capable of significant growth and rearrangement. Clients need
flexibility over the life of the system to easily add capacity, move stations, modify cost control
options, etc.
The architecture of System 25 was implemented with the objective to meet this
need.
● Advanced Administration (optional) is an easy-to-use,
menu driven personal computer
software package for configuring the rich set of system options. Versions of this software
are available for both MS-DOS and UNIX personal computers.
● Uniform Wiring Plan (four-pair) allows a building to be prewired for the rich set of AT&T
Small Business PBX service offerings. This modular wiring plan supports client
reconfiguration of an office with variations in station type (Analog, MET, MERLIN
CommunicationsSystem, futures) and
data configurations (LAN, asynchronous,
synchronous). It supports simultaneous voice and data from standard 4-pair modular jacks.
● System 25/75/85 Standard Architecture supports efficient growth with modular cabinets,
universal carrier slots, nonblocking network, and uniform wiring plan. Every circuit slot in
the system can be used for trunk cards or voice/data station cards. All these attributes
allow the client to add future capability without breakage and re-engineering of existing
equipment. Thus, the client is able to minimize initial investment while not restricting future
growth.
Over time, the type of tools and facilities that a business utilizes changes. It is important that
a PBX provide support for the full set of telephone company network options over its
installed life, even when only a subset is initially used. Trunks link two switching systems,
such as System 25 and the local Central Office or System 25 and another PBX. System 25
supports five different telephone company trunk interfaces to provide desired connectivity at
minimum expense. Thus the opportunity exists to select the best trunk types, depending on
tariffs and customer needs. For example:
● Loop Start (LS) trunks for public network access at minimum tariff. These trunks
handle outgoing and incoming attendant calls, incoming DGC calls, outgoing pooled
facility calls, and personal line calls.
● Ground Start (GS) trunks for public network access. These trunks handle the same
type of calls as LS trunks. They provide protection against call reorigination without
toll restriction, more reliable automatic route selection, virtual facilities, SMDR, and
CAS. Simultaneous incoming and outgoing call seizure of the same trunk under
heavy traffic conditions is essentially eliminated with ground start trunks. GS trunks
should usually be selected in preference to LS trunks unless tariff considerations are
overriding. Note, however, that Centrex Service requires LS trunks.
● Direct Inward Dialing (DID) trunks for dialing a station directly from outside (attendant
assistance not required).
Outside dial access to stations, trunks (optional), and
answering groups (Direct Group calling) is provided.
1-13
OVERVIEW
● Tie Trunks for linking PBXs with dedicated private circuits for high volume calling.
Dial access to stations, other trunks, answering groups (Direct Group Calling), and an
Electronic Tandem Network endpoint capability are provided.
● Off-Premises Stations (OPS) allow a single-line voice terminal to be located remotely
and connected to System 25 via arrangements with the local telephone company.
This service is used to provide users at secondary sites (or their residences) many of
the same features as an on-premises single-line station.
To enhance the usage and control of the above set of network facilities, System 25 provides
the rich set of access features outlined in the Outgoing Business Communications section.
In addition, System 25 can support networking between systems by:
● Serving as an endpoint on an electronic tandem network (ETN) using its tie trunks
and flexible dialing plan.
● Serving as an off-network or on-network access point with its dial access/transfer
between tie trunks and telephone company trunks (LS/GS/DID). This allows usage of
tie trunks to reach a distant System 25 and then connect through that System 25 to
local telephone company facilities to complete the call.
To support efficient utilization of trunks, they can be grouped together (up to 16 groups) if all
trunks in the group perform
the same function. This resource pooling provides better service
with a given number of trunks, and simplifies administration and calling.
Types of trunks that can be assigned in System 25 are as follows.
Central Office, which provide a link with the local telephone company for incoming
and outgoing calls (LS/GS)
Foreign Exchange (FX), which connect to a CO other than the local CO for high
volume calling to/from a distant location
Wide-Area Telecommunications Service (WATS), which connect to an Outward WATS
office or a dial “800” Service Office
Direct Inward Dialing (DID), which provide incoming service from a CO to directly
access a station or facility (STARLAN NETWORK interface, trunk group)
Tie, which provide a link with another private switching system.
To support efficient utilization of this rich set of network options, System 25 provides the
functions outlined in the Incoming and Outgoing Business Communications sections.
1-14
OVERVIEW
Conclusions
System 25 has been targeted at providing excellent small business communications
capability at the right price. The thousands of systems in service in the first 2 years of
production have confirmed that these capabilities are an excellent match with small business
Integrated Solution
Intercept Treatment With Reorder Tones
Interdigit Timeouts
Last Number Dialed
Leave Word Calling
Line Selection
Line Status and I-Use Indications
Local Display
Manual Signaling
Message Center-Like Operation (SLAC Only)
SMDR Call Record Header Format
SMDR Output Equipment
(Sharing Same AC Outlet)
SMDR Output Equipment—On-Premises Direct Connections
(Greater Than 50 Feet From System Cabinet or Not Sharing
Same AC Outlet)
SMDR Output Equipment—On-Premises Switched Connections Figure 2-46
SMDR Output Equipment—Off-Premises Direct Connections
SMDR Output Equipment—Off-Premises Switched Connections
Model 703 System Administration Terminal
SAT On-Premises Direct Connections (Sharing Same AC Outlet)
SAT On-Premises Direct Connections (Greater Than 50 Feet
From System Cabinet or Not Sharing Same AC Outlet)
SAT On-Premises Switched Connections
SAT Off-Premises Direct Connections
SAT Off-Premises Switched Connections
System Features
Station Features
Network Features
Data Features
Attendant Features
Bridged Ringing Options
Partial List of Permissible Data Port (TN726) Options
Typical Option Profiles for Data Port Endpoints
Call Progress Messages for Data Terminal Dialing
Special Descriptors
Features, and Attendant Features of AT&T System 25. It also covers certain services that
support and implement the features; included in this category are the digital tape unit, the
dial plan, system administration, and system maintenance. A general discussion of data
topics is also provided.
The feature descriptions are arranged in alphabetical order, regardless of the feature group
to which they belong.
following five subheadings:Description,
Requirements, and Hardware Requirements. Headings that are
● Description
Defines the feature, describes what it does for the user,
● Considerations
Discusses the applications
parameters and factors to be
● Interactions
Information for each feature is presented under one or more of the
Considerations,
Interactions, Administration
not applicable are omitted.
and how it is used.
and benefits of the feature,
followed by feature
considered when the feature is used.
Lists and briefly describes other features that can affect the feature being described.
Interacting features are those that:
— Depend on each other—
One of the features must be provided if the other
one is.
— Cannot coexist—One of the features cannot be provided if the other one is.
— Affect each other—The operation of one feature modifies, or is modified by,
the operation of the other.
— Enhance each other—The features, in combination, provide improved service
to the user.
●
Administration Requirements
States whether or not administration is required and lists items requiring
administration.
●
Hardware Requirements
Lists any additional hardware needed to use the feature.
2-1
FEATURES AND SERVICES
Symbols Used in Illustrations
Many feature descriptions in this section contain illustrations of equipment and connections.
In the connection figures, modular jacks are shown as triangles; 25-pair cable connectors are
indicated by shaded blocks.
does not have symbol designations.
jack that provides cutdown connections for building (station) wiring.
Feature Tables
Tables 2-A through 2-E list all the features of System 25. Each feature is specified as
Standard or Optional.
Standard features are built into the system. They are always provided but may require
administration to make them operational.
tables by the letter S.
Unterminated wiring that requires cutdown or other termination
The 103A Connecting Block is a typical modular wall
Standard features are identified in the feature
Optional features require both administration and additional equipment. Music-On-Hold is an
example. Optional features are identified by the letter O.
Bracketed words in the tables are the standard labels of the associated feature buttons.
These labels are also used in the feature descriptions.
2-2
FEATURES AND SERVICES
System Features
System features (Table 2-A) are those that affect the entire operation of the system.
Table 2-A.
FEATURE NAME
Call Accounting System (CAS)
Call Management System (CMS)
Dial Plan
Dlctatlon System Access
Digital Tape Unit
Direct Group Calling
Direct Group Calling Delay Announcement
End-to-End Signaling
Extended Stations
External Alerts
Integrated Solution
Intercept Treatment With Reorder Tone
Interdigit Timeouts
Music-On-Hold
Night Service (Directed and TAAS)
Night Service Delay Announcements
Out-Of-Building Stations
Paging System Access
Personal Dial Codes
Pooled Facility-Dial Access
Power Failure Transfer
Remote Administration Interface
Remote Initialization and Maintenance Services (RIMS)
Station Message Detail Recording (SMDR)
System Administration
System Maintenance
Touch-Tone and Dial Pulse Service
deice Message System
System Features
FEATURE
TYPE
O
O
s
O
O
S
O
S
O
O
O
S
S
O
S/O*
O
O
O
S
S
O
O
S
O
O
S
S
O
* S/O - Standard for Directed, Optional for TAAS Night Service.
2-3
FEATURES AND SERVICES
Station Features
The many Station Features (Table 2-B) available allow individual user needs to be met. As
these needs change, assigned features can also be changed. Station Features provide
many
important services that help save time and make calling more convenient.
Table 2-B.Station Features
FEATURE NAMESINGLE-LINE
Account Code Entry, Forced (FACE)
Account Code Entry, Optional
Automatic Intercom[AUTO ICOM]
Bridging of System Access Buttons
Busy-to-Idle Reminderx
Callback Queuing
Calling Restrictions
Call Accountability
Call Progress Tones
Call Waiting
Conference
Conference Drop
Coverage-Group
Coverage-lndividual
Dial Access to Message Waiting Indicationsx
Direct Station Selection (DSS)
Directory[DIRECTORY]
Display[SCROLL]
Distinctive Ringingxx
Exclusion[EXCLUSION]
Following
Forwarding
Hands-Free-Answer On Intercom (HFAI)[AUTO ANS]
Headset Adapter Adjunct
Hold
Inspection
Last Number Dialed[LAST # DIALED]
Leave Word Calling (LWC)x[LEAVE WORD]
Line Selection
Line Status And l-Use Indications
Local Display
Manual Signaling[SIGNAL]
Messaging Services
Park
Personal Lines
Pickup
Pooled Facility-Button Access
TERMINALBUTTON LABEL
x
x
xx
xx
xx
xx
x
x
x
x
x
xx
x
x
x[HOLD]
xx
x
x
MULTILINE TERMINALFEATURE
[ACCT ENTRY]
x
[CONFERENCE]
[DROP]
[COVER-GRP]
[COVER-IND]
x
[DSS] or [FLEX DSS]
[INSPECT]
x
[LOCAL]
[PERS LINE]
[FACILITY]
TYPE
S
S
S
S
S
S
S
S
S
S
s
S
S
S
S
S
O
O
S
S
S
S
O
O
S
O
S
O
S
S
O
S
S
S
S
S
S
2-4
Table 2-B. Station Features (Contd)
FEATURES AND SERVICES
FEATURE NAME
Program
Recall
Repertory Dialing
Send All Calls
Speaker (Spokesman Service)
Speakerphone Adjunct
Speed Dialing
Station Hunting
Station-To-Station Message Waiting[MSG WAIT]
Test
Transfer
Trunk-To-Trunk Transferxx
SINGLE-LINE
TERMINALBUTTON LABEL
xx
x
x
xx
x
x
MULTILINE TERMINAL
[REP DIAL]
[SEND ALL CALLS]
[SPEAKER]
x
[TRANSFER]
FEATURE
TYPE
S
S
S
S
S
O
S
S
S
S
S
S
Network Features
This group of features (Table 2-C) supports communications with the public network and with
other locations in the private network of which System 25 can be a part.
Table 2-C.
FEATURE NAME
Network Features
FEATURE
TYPE
Automatic Route Selection
Direct Inward Dialing
Off-Premises Stations
Remote Access
Tandem Trunking
Tie Trunks
Trunk Groups
Virtual Facilities
S
O
O
S
O
O
S
S
2-5
FEATURES AND SERVICES
Data Features
Data Features (Table 2-D) support the switched data services of the system. Data services
provide switched connections between analog and digital data endpoints.
Table 2-D.
FEATURE NAME
Command Mode
Communications Access Manager
Data Call Setup
Data Terminal Dialing
Expert Mode
Modem Pooling
AT&T STARLAN NETWORK Access
Third-Party Call Setup
Transfer to Data
User Changeable Options
Data Features
MULTILINE TERMINAL
BUTTON LABEL
I
[DATA]
FEATURE
TYPE
S
O
S
S
S
O
O
S
S
S
2-6
FEATURES AND SERVICES
Attendant Features
Attendant Features (Table 2-E) are available to the attendant using the Direct Trunk
Attendant Console (DTAC) or the Switched Loop Attendant Console (SLAC) and the optional
Direct Extension Selector Console. In addition, most muitiline voice terminal station features
are available to the attendant.
Attendant Splitting One-Way Automatic
Attendant System Alarm Indication
Message Center-Like Operation (SLAC only)
Night Service
[START]
[CANCEL]
[JOIN]
[ATT MSG]
[ATTENDANT
MESSAGE WAITING]
[POS BUSY]
[RELEASE]
[RTN-BUSY]*
[RTN-DA]*
[ALARM]
[NIGHT]
FEATURE
TYPE
S
S
S
O
O
O
S
S
S
S
S
S
S
S
S
S
S
S
S
* This button is assigned on the DTAC only,
2-7
FEATURES AND SERVICES
Account Code Entry, Forced
Description
This feature forces selected station users to enter account codes before dialing certain calls
out of System 25.
required to enter account codes either for all outgoing calls or for just “dial 0 or 1” toll calls.
The code entries appear in the ACCOUNT field of the SMDR records.
To make a FACE-restricted call, the user must dial the Account Code Entry access code *0
followed by an account code before dialing the rest of the call. The account code entry is
terminated when the number of digits entered equals the number administered for system
account codes or when # is entered. The user hears second dial tone after the code is
entered and can then dial the necessary access codes and other numbers to reach the
destination.
If the user makes an error while entering the account code, the procedure can be corrected
by dialing *0 followed by the correct account code.
Users at stations that have Forced Account Code Entry (FACE) are
The user receives reorder tone when an account code is required on a call but not entered.
Considerations
FACE ensures that specified outgoing calls include information (project, client, department,
etc.) to be used for accounting and billing purposes.
The voice terminal user cannot use the Account Code Entry feature button for forced entry.
This button is used with the Optional Account Code Entry feature only.
An account code entry cannot be forced for the following types of calls:
● Personal Line calls
● Direct Facility Access calls
● Remote Access
● Calls to 911 and the three ARS-administered emergency numbers, when using ARS.
FACE requirements apply to calls using these facilities and features:
● Repertory Dialing
● Personal/System Speed Dialing
● ARS (nonemergency) and pooled facility access codes
● Trunk calls using Conference or Transfer.
2-8
Account Code Entry, Forced
The system does not check the validity of account codes. It checks only for the proper
number of digits or the code terminator #.
Calls that do not require FACE can still be assigned an account code, as in previous releases
of System 25.
manual for the procedures.
Interactions
The following features interact with Forced Account Code Entry.
Bridging of System Access Buttons: Calls made from Bridged Access (BA) buttons on a
bridging station follow the FACE restrictions of the bridging station, not of the associated
principal station.
Call Accountability: The account code entry may be made before or after the Call
Accountability entry. Dial tone is returned to the user after either entry.
Refer to the “Account Code Entry, Optional” feature description in this
Callback Queuing: An account code entered before queuing is saved for SMDR.
Conference: Calls can be conference in both directions between a FACE-restricted station
and a non-FACE station.
Display: When a user activates the Forced Account Code Entry feature by dialing *0, the
system displays the prompt ACCT?.
displayed to the right of the prompt.
automatically scrolls to Screen 2; the continuation character “-” and the remaining digits
appear on Screen 2.
The prompt and digits remain displayed until one of the following occurs:
— The user enters either “#” or the administered number of code digits.
— The user restarts the Account Code Entry feature by dialing *0 to correct an
erroneous entry.
— The system time-out for Account Code Entry is reached.
— The user selects another button that overwrites the display.
Forwarding: Stations with FACE administered for all calls cannot forward calls to any
outside numbers, Stations with FACE administered for “dial 0 or 1” calls can forward calls
to any outside number except for “dial 0 or 1” numbers.
As the user enters the account code, the digits are
If the number of digits exceeds 9, the system
Intercept Treatment with Reorder Tone:
code is required on a call but is not entered.
Last Number Dialed: The access code *0 and the account code are not stored by this
feature.
The user receives reorder tone when an account
2-9
EATURES AND SERVICES
Remote Access: Remote access callers cannot enter account codes.
Third-Party Call Setup: If the source station is FACE-restricted, the third-party data terminal
must prefix the outside destination number with *0 and an account code.
Transfer: Calls can be transferred in both directions between a FACE-restricted station and
a non-FACE station.
Administration Requirements
Account code entry is administered on a per-station basis—
Calls, or Forced for Dial 0 or 1 Toll Calls Only; default = Optional.
FACE cannot be administered for data ports.
Optional, Forced for all Outgoing
2-10
Account Code Entry, Optional
Account Code Entry, Optional
Description
Optional Account Code Entry allows voice terminal users to associate an account code with
incoming and outgoing calls. The account code is appended to the SMDR call record and
can be used later for accounting or billing purposes.
For an incoming call, the user must enter the account code at the end of the call. For an
outgoing call, the user has a choice of entering the code at the beginning of the call, before
the destination is dialed, or at the end of the call. An account code entry is terminated when
the number of digits entered equals the number administered for system account codes,
when # is entered, or when the user hangs up. The procedures for associating an account
code with a call are as follows:
● Single-Line Voice Terminal User
Get dial tone (by going off-hook at the beginning of a call or by flashing the
switchhook before hanging up) and dial *0; then dial the account code directly or dial
a System or Personal Speed Dialing Number that contains the account code. If the
code is dialed incorrectly (before the last digit), redial *0 and the correct number.
● Multiline Voice Terminal User
At the beginning of an outgoing call, get dial tone and dial *0; then dial the account
code directly or dial a System or Personal Speed Dialing Number that contains the
account code. If the code is dialed incorrectly (before the last digit), redial *0 and the
correct number. At the end of a call, press ACCT ENTRY and enter the code before
hanging up. A Repertory Dialing (REP DIAL) button can also be used to enter an
account code. If the code is dialed incorrectly (before the last digit), press ACCT
ENTRY again and dial the correct number.
When the correct number of account code digits has been entered (or # is entered to signal
end-of-dialing), confirmation tone is returned to the user, and the account code is appended
to the SMDR call record.
Considerations
Optional Account Code Entry provides an easy method of allocating the costs of specific
calls (and associated staff time) to the correct project, department or user. The account
code is appended to the SMDR call record and sent to the SMDR output channel.
Account Codes can contain up to 15 digits.
The system does not check the validity of account codes. It only checks for the proper
number of digits or the code terminator #.
If the user is active on a call, invoking the feature will drop the call.
2-11
FEATURES AND SERVICES
Erroneous account codes that are not corrected before the last digit is entered are recorded
and cannot be changed. Partial account codes entered by going on-hook before completing
the entry are recorded and cannot be changed.
If, before all digits have been entered, (1) the user goes on-hook, (2) a button other than
ACCT ENTRY is pressed, or (3) 30 seconds have elapsed since the feature was invoked, the
SMDR call record will show the digits dialed up to that point.
Optional Account Code Entry cannot be invoked for a call on hold.
Interactions
The following features interact with Optional Account Code Entry.
Bridging of System Access Buttons:Account codes can be entered for incoming or
outgoing calls on Bridged Access buttons using normal feature operations.
Callback Queuing: An account code entered before queuing is saved for SMDR.
Conference: If more than one user attempts to enter an account code on a Conference Call,
the first to enter a code will prevail.
Display: When a user activates the Account Code Entry feature by dialing *0 or pressing
ACCT ENTRY, the system displays the prompt ACCT?. As the user enters the account code,
the digits are displayed to the right of the prompt.
If the number of digits exceeds 9, the
system automatically scrolls to Screen 2; the continuation character “-” and the remaining
digits appear on Screen 2.
The prompt and digits remain displayed until one of the following occurs:
● The user enters either “#” or the administered number of code digits.
● The user restarts the Account Code Entry feature by dialing *0 or pressing ACCT
ENTRY again, to correct an erroneous entry.
● The system time-out for Account Code Entry is reached.
● The user selects another button that overwrites the display.
Remote Access: Remote access callers cannot enter account codes.
Repertory Dialing: An account code can be stored on a REP DIAL button.
Speed Dialing: An account code can be stored in a System or Personal Speed Dialing code.
Transfer: A user can transfer a call to another user, then, before hanging up, enter an
account code. Subsequent account code entries for the same call will be ignored, even
though confirmation tone has been returned.
2-12
Account Code Entry, Optional
Administration Requirements
System:
● Assign number of Account Code digits (0-15; default = 15).
Requires an RS-232 compatible 80-column ASCII (serial) printer or other device to output
Station Message Detail Recording (SMDR)/Account Code entries.
2-13
FEATURES AND SERVICES
Attendant Call Extending
Description
This feature allows the attendant to put a call in a special hold condition, call another station,
then connect the two calls together.
separate the call from the console or remain connected to the other parties. Attendant Call
Extending is a feature used at either a Direct Trunk Attendant Console (DTAC) or a Switched
Loop Attendant Console (SLAC).
The attendant can withdraw from the connection and
Note:
The attendant, after placing or answering a call, can use Procedure 1 or 2 to extend this call
to an inside extension or Procedure 1 to extend it to an outside number:
1.
2.
If ringing tone is heard, the attendant presses RELEASE (Manual Release) to connect the
caller to the ringing line and separate the call from the console. As an alternative, a DTAC
attendant or a SLAC attendant (with Automatic Release administered) can go straight to
another call by pressing any facility button, such as System Access, Loop, Automatic
Intercom, or an outside line; this completes the call extending procedure. (if a SLAC
attendant has Automatic Hold administered instead of Automatic Release, pressing a facility
button simply puts the incoming call on hold and does not extend it.)
In general, the attendant should not use the TRANSFER button, which
invokes the standard multiline voice terminal Transfer feature, to extend calls.
If Transfer is used, busy or unanswered calls cannot return to the attendant
console for further handling.
Press START to place the incoming call on hold via the Attendant Splitting One-Way
Automatic feature. After receiving Dial Tone, the attendant then dials the requested
inside or outside number.
or
Press the Selector Console Group Select and Direct Extension Selection (DXS)
buttons associated with the requested inside station. This operation is equivalent to
pressing START and dialing the extension.
The attendant has the option of staying connected to the ringing line to announce the call
before connecting the two parties.
other parties in a 3-way connection by using the Attendant Join feature.
If busy tone is heard and Attendant Camp-On (see associated feature description) is not
desired, the attendant presses CANCEL and is reconnected to the calling party.
If busy tone is heard on a call to an inside station and Attendant Camp-On is desired, the
attendant presses RELEASE. The called party hears a tone burst, and the call waits at the
called voice terminal. When a busy single-line station goes on-hook, or a busy multiline
station System Access button becomes idle, the call automatically begins ringing at the
station.
2-14
The attendant can then release or (SLAC only) join the
Attendant Call Extending
Calls extended to an idle voice terminal that are not answered within a specified time return
to the Attendant Console on an idle LOOP button (SLAC only) or on the Return-On-Don’t-
Answer (RTN-DA) button (DTAC only). Calls camped-on at a busy voice terminal that are not
answered within a specified time return to the Attendant Console on an idle LOOP button
(SLAC only) or on the Return-On-Busy (RTN-BUSY) button (DTAC only). If a SLAC is not
available to incoming calls (busy on another call, in Position Busy mode, etc.), a returning call
remains in the console queue until the console can handle it. If the Return buttons on a
DTAC are busy, an extended call remains at the called terminal until that button becomes
idle.
Considerations
Attendant Call Extending allows the attendant to utilize the additional attendant related
features such as Attendant Splitting One-Way, Release, Cancel, Return-On-Don’t-Answer,
Return-On-Busy, Forced Release (SLAC), Join (SLAC), and Source/Destination (SLAC).
For information on related Attendant Features (Table 2-E), refer to the individual feature
descriptions.
Interactions
The following feature interacts with Attendant Call Extending.
Forwarding: Calls extended by an attendant to a forwarding station will be given normal
Forwarding treatment.
Administration Requirements
System:
● Number of seconds before a Camped-On call returns to the Attendant Console (1-
120 or 0 for no Attendant Camp-On; default = 30).
● Number of rings before unanswered call returns to the Attendant Console (1-31;
default = 5).
2-15
FEATURES AND SERVICES
Attendant Camp-On
Description
This feature allows the attendant to extend a trunk call to a busy voice terminal and leave it
waiting or “camped on” there. After hearing busy tone, the attendant presses RELEASE to
camp-on this call at the busy terminal.
handset of the called terminal and the caller is placed on hold (hearing music-on-hold if
available). When a System Access button at a multiline set becomes idle or a single-line
terminal hangs up, the camped-on call is connected automatically and ringing begins.
Considerations
A camped-on call can be answered by a busy single-line user without losing the current call
by momentarily pressing the switchhook (which places the current call on hold) and then
dialing *9. Multiline terminal users cannot do this. However, if they have a System Access-
Originate Only button, they can place all other calls on hold, go off-hook on that button and
dial *9 to pick up the camped-on call.
When this is done, a burst of tone is heard in the
If the camped-on call is not answered within a specified time, the call will be returned to the
Attendant Console in one of the following ways:
● Switched Loop Attendant Console
The call returns to the common queue, where it remains until the console can receive
it at a LOOP button.
● Direct Trunk Attendant Console
The call returns to the Return-On-Busy (RTN-BUSY) button. If that button is busy,
the call remains camped-on at the called terminal until the RTN-BUSY button of the
console becomes idle.
For information on related Attendant Features (Table 2-E), refer to the individual feature
descriptions.
Interactions
The following features interact with Attendant Camp-On.
Call Waiting: Trunk calls camped onto a station by an attendant are given priority over other
waiting calls.
Callback Queuing: Trunk calls camped onto a station by an attendant are given priority over
queued calls.
Coverage: If the called party is a sender in a Coverage group and all receivers of the
Coverage group are busy, the call will camp onto the originally-dialed station. Once
camped-on, calls will no longer receive coverage even if a coverage receiver becomes idle.
2-16
Attendant Camp-On
Direct Group Calling: The attendant can camp-on more than one call per DGC group. Voice
terminals in the group do not receive a burst of tone when a call is camped on. Trunk calls
camped onto a busy DGC group go into the DGC queue and are eligible for delay
announcement and music-on-hold.
Direct Inward Dialing (DID): DID calls can be covered by the attendant and then given
Camp-On treatment. They do not automatically receive Call Waiting.
Station Hunting: If the called party is a member of a hunt group and all members of the
group are busy, the call camps onto the originally-dialed station. Once camped-on, calls will
no longer hunt even if another member of the hunt group becomes idle.
Administration Requirements
System:
● Number of seconds before a camped-on call returns to the Attendant Console (1-120
or 0 for no Attendant Camp-On; default = 30).
2-17
FEATURES AND SERVICES
Attendant Cancel
Description
This feature allows the attendant to terminate an attempt to extend any incoming call if the
called station does not answer, or if the station answers but declines to accept the call. The
attendant presses CANCEL and is automatically reconnected to the calling party. The call
can then be ended by hanging up or by pressing RELEASE.
Pressing CANCEL when the Start facility is not active will be ignored.
Considerations
Attendant Cancel allows the attendant to terminate a call transfer
incoming held party via a one-button operation. This enhances
handle calls quickly and efficiently.
attempt and return to the
the attendant’s ability to
2-18
Attendant Console, Direct Trunk
Attendant
Console, Direct Trunk
Description
In System 25
directed to specific user stations, to answer calls from inside users, to extend calls to inside
stations and outside numbers, and to assist system users in placing outgoing calls and
setting up conferences. The attendant can also manage and monitor some areas of system
operation. System 25 supports either the Direct Trunk Attendant Console (DTAC) or the
Switched Loop Attendant Console (SLAC), which is covered in the next feature description in
this manual. Consoles of both types cannot be installed in the same system.
The DTAC (Figure 2-1) can be one of the Merlin Communications System multiline voice
terminals listed below, administered with special features, buttons, and capabilities to serve
as an attendant position.
● 7305H02D (34 programmable feature buttons each with I-use and status LEDs)
● 7316H01A (34 programmable feature buttons each with I-use and status LEDs; built-
in speakerphone)
In addition to the attendant features, most standard multiline terminal features are also
available. (Refer to the Hardware Description section of this manual for a complete
identification of the external controls, indicators, and components of the DTAC voice
terminal.)
the Attendant Console is used to answer incoming trunk calls that are not
DIRECT TRUNK ATTENDANTOPTIONAL SELECTOR
Figure 2-1.
CONSOLE
Typical Direct Trunk Attendant Console Position
CONSOLE
The DTAC is always equipped with the following feature buttons that provide unique
attendant console functions.
Each button has a green status LED that indicates when the
feature is activated.
2-19
FEATURES AND SERVICES
● Start [START]: Initiates the call extending process by placing a caller on hold and
providing internal dial tone to the attendant
● Cancel [CANCEL]: Terminates the
“Start” operation and reconnects the attendant
to the calling party.
● Release [RELEASE]: Releases the attendant from an active call and completes the
call extending process.
● Return-On-Busy [RTN-BUSY]: Camped-on calls are returned to the console on this
button if not answered within a specified interval.
● Return-On-Don’t-Answer [RTN-DA]:
Extended calls not answered are returned to
the console on this button if not answered within a specified interval.
● Attendant Message Waiting [ATT MSG]: Used by the attendant to remotely control
Message LEDs on voice terminals.
● Alarm [ALARM]: The associated status LED flashes when a system trouble has
been detected; the LED can be changed from flashing to steadily lit by pressing the
button.
Two other attendant-only features are assigned to console feature buttons if required,
Position Busy [POS BUSY] and Night Service [NIGHT]. In a dual attendant console system,
Position Busy removes an Attendant Console from service.
in the “Position Busy” mode at a time.
When Night Service is activated, attendant-seeking
Only one of two consoles can be
calls can ring a night bell, can be directed to assigned voice terminals, or can be sent to a
night service announcement.
Dual Console Operation
A System 25 can be equipped with up to two DTACs that operate simultaneously when both
are in service.
If the system has two attendant consoles, one is called the first attendant
console; the other is called the second attendant console. The calls in the following list will
be routed to the first attendant console.
● Dial “0” calls
● DID calls to unassigned numbers (when administered to route to the attendant)
● Calls to Floating Personal Dial Codes (FPDCs) not signed in anywhere (if
administered to route to the attendant)
If the first attendant has activated the Position Busy feature or is busy on all System Access
buttons, these calls will be routed to the second console. If that console is also busy on all
System Access buttons, busy tone is provided to the calling party.
System users and DID callers can reach a particular attendant by dialing the Personal Dial
Code (PDC) assigned to the desired attendant.
2-20
Attendant Console, Direct Trunk
Position Busy
A POS BUSY button can be assigned to each console; this permits selection of one of two
modes of operation: (1) simultaneous operation or (2) only one Attendant Console active.
(Note that only one console is allowed to be inactive at any given time.) An associated POS
BUSY status LED is lighted when the console is inactive.
terminations on the rightmost two columns of buttons of the inactive console. Ringing
disabled on an inactive console will be enabled on the active console for those trunks with
dual appearances (appearances on both consoles).
including those on the associated Attendant Direct Extension Selector Console will continue
to function normally even though the console is inactive.
Ringing is disabled on all trunk
All other features on all buttons,
Considerations
Direct trunk operation means that trunks are terminated on individual buttons, called
Personal Line buttons, where outside calls are answered and originated. The console can
have several incoming calls ringing simultaneously.
Each console can also have an optional Attendant Direct Extension Selector Console to
enhance internal calling. The Selector Console is covered in the “Attendant Direct Extension
Selection” feature description.
For information on related Attendant Features (Table 2-E), refer to the individual feature
descriptions.
Interactions
The following features interact with Direct Trunk Attendant Console.
Attendant Console, Switched Loop:
Switched Loop Attendant Console.
Bridging of System Access Buttons:
Callback Queuing: The attendant can queue calls that are extended using the normal
START-RELEASE button operation. However, calls originated using only the START button
(no other call put on hold) cannot be queued.
Call Waiting: Calls cannot wait at a DTAC.
Display: The DTAC does not support Display.
A DTAC cannot operate in the same system with a
A DTAC cannot serve as a principal station.
2-21
FEATURES AND SERVICES
Administration Requirements
System:
● Display attendant position number {first or second).
● Assign number of rings before unanswered calls return to the Attendant Position (1-
31; default = 5).
● Force DID calls to unassigned numbers to ring at the Attendant Position (yes or no;
default = yes).
● Force calls to FPDCs that are not signed in anywhere to ring at the Attendant
Position (yes or no; default = yes).
● Assign number of seconds before an unanswered Camped-On Call returns to the
Attendant Console (1-120 or 0 for no Attendant Camp-On; default = 30).
Attendant Console (Voice Terminal) Port:
● Assign voice terminal type (309).
● Assign buttons for Night Service and Position Busy, if required. Attendant Message
Waiting is defaulted to button 14, but can be assigned to any programmable button.
● The following buttons are predefine on the Attendant Console and are not
administrable: ALARM, RTN-DA, RTN-BUSY, START, CANCEL, and RELEASE.
● Trunk terminations; the following is required for each trunk terminated on the console
(administered as Personal Line appearances; DID trunks cannot be terminated on a
DTAC):
— Trunk Number
—
Make this the Principal Station (owner) of the trunk (yes or no).
—
Enable Ring (yes or no).
Hardware Requirements
Each console requires a port on a ZTN79 ATL Line circuit pack.
Figure 2-2 provides a connection diagram for the DTAC.
2-22
SYSTEM 25
CABINET
ZTN79
HYBRID
LINE CP
PART OF
OCTOPUS CABLE
C2
PART OF SIP
SIP
ADAPT.
W1
Attendant Console, Direct Trunk
DIRECT TRUNK
B1
C1
ATTENDANT
CONSOLE T1
LEGEND:
B1
— TYPICAL-103A CONNECTING BLOCK*
— MODULAR CORD (D8W-87) - FURNISHED WITH SET
In System 25, the Attendant Console is used to answer incoming trunk calls that are
specified to ring at an attendant position, to answer calls from inside users, to extend calls to
inside stations and outside numbers, to assist system users in placing outgoing calls, and to
set up conferences.
operation. System 25 supports the Switched Loop Attendant Console (SLAC) or the Direct
Trunk Attendant Console (DTAC), which is covered in the preceding feature description of
this manual. Consoles of both types cannot be installed in the same system.
The SLAC (Figure 2-3) can be one of the Merlin System multiline voice terminals listed below,
administered with special buttons, features,
console. In addition to the attendant features, most standard multiline terminal features are
also available. (Refer to the “Hardware Description”
identification of all the external controls, indicators, and components of the SLAC voice
terminals.)
The attendant can also manage and monitor some areas of system
and capabilities to serve as an attendant
section of this manual for a complete
● 7305H04C (34 programmable feature buttons; built-in speakerphone and display)
● 7317H01A (BIS-34D—34 programmable feature buttons each with I-use and status
LEDs; built-in speakerphone and display)
SWITCHED LOOP
ATTENDANT CONSOLE
Figure 2-3.
Typical Switched Loop Attendant Console Position
OPTIONAL SELECTOR
CONSOLE
Associated with the SLAC are message center-like capability and display support. The
message center feature provides for efficient handling of calls that should be sent to
message takers. These calls are directed to a message center console position through
administration of call type translations.
assigned to extension numbers and
information to the attendant when calls
Display service allows identifiers (names) to be
trunks.
The system then displays the appropriate
are processed at the console.
2-24
Attendant Console, Switched Loop
The Switched Loop Console derives its name from the ability of the system to hold incoming
attendant-bound calls in a queue and switch them on voice loops to an available console.
Calls are directed to a console in a preadministered, prioritized sequence. The SLAC differs
from the DTAC in the following basic respects:
● It receives calls one at a time, regardless of the number of incoming calls to the
system (at the DTAC, many incoming calls can be ringing simultaneously).
● It displays pertinent information about incoming and outgoing calls.
● It can serve as an attendant console, a message center, or a combination of both.
● It has speakerphone and Hands-Free Answer on Intercom (HFAI) capabilities.
Fixed Buttons (Figure 2-4)
The SLAC has five fixed line appearance, or
answered.
Each button has a red I-use LED and a green status LED. These buttons
“LOOP,” buttons where all incoming calls are
represent voice links (loops) between the console and the switch. The loops also provide the
paths for outgoing calls.
In addition to the LOOP buttons and standard multiline terminal buttons (HOLD, TRANSFER,
etc.), the console is equipped with the following feature buttons that provide unique attendant
functions. On the deluxe SLAC, all of these buttons have both I-use and status LEDs; on the
basic SLAC, only the buttons specifically noted have LEDs.
● Start [START]: Initiates the call extending process by placing a caller on hold (on the
Source button) and providing internal dial tone to the attendant.
● Cancel [CANCEL]: Terminates the “Start” operation and reconnects the attendant to
the calling party (on the Source button).
● Release [RELEASE]: Releases the attendant from an active call and completes the
call extending process.
● Source [SOURCE]: Reconnects the attendant to the calling party after a call has
been initiated to the called party but before the two parties have been connected
together. (i-use and status LEDs on basic SLAC.)
● Destination [DEST]: Connects the attendant to the called party again after the
attendant has operated the Source button to speak to the calling party. (I-use and
status LEDs on basic SLAC.)
● Join [JOIN]: Joins together (in a 3-way connection) the attendant and the other
parties in an extended call.
● Forced Release [FORCED RELEASE]: Drops all active parties from a call.
● Last Number Dialed [LAST # DIALED]: Redials the last number dialed.
2-25
FEATURES AND SERVICES
●
Position Busy [POS BUSY]: Temporarily removes the attendant position from service.
(I-use and status LEDs on basic SLAC.)
●
Attendant Message Waiting [ATTENDANT MESSAGE WAITING]: Used by the
attendant to remotely control Message LEDs on voice terminals. (Status LED only on
basic SLAC.)
●
Alarm [ALARM]: The associated status LED flashes when a system trouble has been
detected; the LED can be changed from flashing to steadily lit by pressing the button.
(I-use and status LEDs on basic SLAC.)
●
Inspect [INSPECT]: Puts the display into a mode for inspecting the status or stored
information of certain buttons. (Status LED only on basic SLAC.)
●
Scroll [SCROLL]: Causes display to present additional call information, when
available.
●
Local [LOCAL]: Allows display to be used for clock and calendar functions.
The buttons not assigned to normal voice terminal functions or to attendant functions are
defaulted to the Flex DSS feature. One of these programmable buttons can be assigned to
Night Service, if the feature is required, and any of the others to multiline voice terminal
features.
Programmable Feature Buttons (Figure 2-4)
The features in the following list can be assigned to the programmable feature buttons. On
the deluxe SLAC, each of the programmable buttons is equipped with an I-use LED and a
status LED. On the basic SLAC the buttons do not have LEDs.
Account Code Entry
Agent Status for CMS
Auto Answer
Auto Intercom
Call
Direct Facility Access
Exclusion
Flex DSS
Leave Word Calling
Manual Signaling
Next
Repertory Dialing
Direct Station Selection (DSS)Station-to-Station Message Waiting
Directory
Transfer to Data
Flex DSS and Repertory Dialing can be programmed with dialable numbers by the attendant.
When a call is placed using a Flex DSS button or a Repertory Dial button, one of the five
switched loops is automatically selected for routing the call to the switch.
2-26
Attendant Console, Switched Loop
Display (Figure 2-4)
The SLAC contains an alphanumeric call information display. This module is built into the
top of the console.
controls, and a thumbwheel Contrast adjustment. Timer functions are available only when
the attendant presses the Local button. The Time/Timer Exit button allows the user to select
ordinary clock/calendar display or a timer.
set the clock. In Timer mode, Start and Stop are used to time events.
The primary purpose of the console display is to provide the attendant with descriptive
information about incoming and outgoing calls. This information includes extension numbers
and associated names, trunk identifiers, reasons for call return and redirection, and number
of calls waiting in the queue for service.
detailed discussion of call information displays.
The console display also provides access to the system’s integrated directory and allows the
attendant to search for the extension numbers assigned to users. Refer to the “Directory”
description for information on this feature.
It contains a 16-character 5x7 dot matrix liquid crystal display, timer
In the Time mode, Set, Fwd, and Rev are used to
Refer to the “Display” feature description for a
Switched Loop Operation
All calls that are intended for an attendant position are first routed by the system to a
common queue where they wait to be sent to a console. In a configuration having two
consoles, the same queue serves both consoles.
available to receive a call, the system removes a call from the queue and directs it to an idle
loop on the console. Calls are selected from the queue on the basis of “first in/first out” and
in accordance with administered priorities. An available attendant console is one that is not
active on a call, has no calls ringing, has at least one LOOP button idle, is not in Position
Busy or Inspect mode, and is not in a split condition.
In a two-console arrangement, each console can be administered to receive all types of calls
or to receive only specific types. A call that can be received by either position goes to the
first available attendant; when both are available, the call goes to the attendant who has
been idle the longest time. If one console is in “Position Busy” mode, all calls (except
Attendant PDC, Attendant PDC via DID, and DGC calls) direct to the other console.
An incoming call from the queue to a console appears on one of the five LOOP buttons; the
attendant is alerted to the call by audible ringing, a steadily lighted red lamp, and a flashing
green lamp. While the call is ringing and while the attendant is handling the call, the system
will direct no more calls to the console. After the attendant ends or releases the call or puts
it on hold, another call can come in on an idle button.
It should be emphasized that even when all LOOP buttons on a console are idle, only one
call can be directed from the queue to the console.
LOOP button is no longer available, but a new call can come in on another button that is idle.
When an attendant console becomes
If the attendant puts a call on hold, that
Answering a Call on a LOOP Button
At an available SLAC, an incoming call will ring at an idle LOOP button automatically selected
by the system.
button is not necessary.
The attendant has only to lift the handset to answer the call; pressing the
2-27
FEATURES AND SERVICES
Placing a Call on a LOOP Button
In general, originating a call at an idle SLAC involves going off-hook and then dialing the
desired number. If the console is not idle, the attendant can generally use one of these
procedures:
● Split the active call (that is, put it on temporary hold by pressing the Start button) and
place another call on the same button; this is the normal call-extending procedure.
● If the Automatic Hold feature is enabled, press another LOOP button to place a new
call; the first call goes on hold.
● If the console does not have Automatic Hold (that is, it has the default Automatic
Release), use the Hold button to put the active call on hold; then select a new loop to
place a new call.
Dual Console Operation
A System 25 can be equipped with up to two SLACs, which operate simultaneously when
both are in service. Both consoles can receive the same types of calls, or each can be
administered to receive only certain types. When one console is out of service (see Position
Busy below), most calls are directed to the other.
Either or both consoles can function as a
message center.
Inside users can reach either attendant by dialing 0, or a particular one by dialing the
attendant’s PDC. DID callers can use the Attendant’s private DID number or the common
queue.
Position Busy
Operation of the Position Busy button by the attendant makes the console unavailable to
most incoming calls from the common queue and directs the calls to another answering
station. The only types of calls that are not diverted by Position Busy are Attendant DID,
DGC, and PDC calls. The placing of outgoing calls is not affected. When the Position Busy
condition is active, the green status lamp of the button lights steadily. Position Busy is
similar to the Send All Calls feature, which is not administrable on the SLAC.
The Position Busy feature is automatically assigned to a button position (see Figure 2-4)
when the console is administered. In a one-console configuration, however, the feature is
enabled only if a multiline voice terminal in the system is administered as a receiver of calls
from the common queue while the console is unavailable. If this is not done, the button
should be reassigned to another of the permissible features.
In a two-console configuration, an attendant in Position Busy mode will be covered by the
other attendant. Only one console can be in Position Busy mode at a time.
2-28
Attendant Console, Switched Loop
Call Types
The following types of attendant-seeking calls are sent to the common queue and then
directed to an idle LOOP button at a console:
Incoming trunk calls that are administered to ring in the queue.
Dial Operator calls (placed from inside stations by dialing 0)
Following calls signed in at the console
Calls to Floating PDCs (FPDCs) that are not signed in at a specific station
Direct Inward Dialing (DID) calls to numbers that are not assigned to specific stations
Attendant DID calls
Calls to the attendant’s PDC
Coverage calls for which the common queue is a covering receiver
Returning calls.
An incoming trunk connected directly to a DGC group can also be assigned to the Attendant
Queue. Calls ringing simultaneously at the DGC group and at the console will be connected
to the facility that answers first.
The order in which calls are serviced is established by system administration. Each type of
call is assigned a priority that determines its position in the common queue with respect to
other types.
one-attendant system, all calls automatically go to that attendant. If a system has two
attendants, however, administration can direct calls of each type (with the exceptions noted
below) to either position or to both positions.
console or to the specific console that originated them.
Following and Attendant PDC calls can be assigned priorities but cannot be directed to a
specific attendant in a two-position system.
(DID and Dial-in Tie Trunks) can be assigned a priority and be directed to a specific attendant
position or to both.
Calls accessed by dialing a code [Pickup at other extensions, Trunk-Answer-from-AnyStation (TAAS) Night Service calls, and calls parked by other stations] are originated at a
LOOP button and brought to the console on that same button. These calls do not enter the
common queue.
System administration also establishes where the calls go. Obviously, in a
Returning calls can be directed to either
Any trunk except types 901-902 and 1003-1008
2-29
FEATURES AND SERVICES
RED
I-USE -
GREEN
STATUS
Timer
Start
Set
Loop
● Loop
●
● Loop
●
● Loop
●
● Loop
●
Conference
Drop
Stop
Fwd
1 2 3
Rev
❑❑❑
4 5 6
❑❑❑
7 8 9
❑❑❑
* 0 #
❑❑❑
Time/
Timer
ExitContrast
●
Alarm
●
● Pos
● Busy
● Flex DSS
●
●
Source
●
●
Dest
●
Transfer
Hold
-----------------
●
Inspect
●
●
Local
●
●
Flex DSS
●
●
Flex DSS
●
●
● Flex DSS
●
Flex DSS
●
●
Flex DSS
●
Flex DSS
Flex DSS
Flex DSS
Cancel
Start
●
Scroll
●
Forced
● Release
● Last #
● Dialed
●
Flex DSS
●
●
Flex DSS
●
●
Flex DSS
●
●
Flex DSS
●
Flex DSS
Flex DSS
Attendan
● Message
● Waiting
Join
Release
Figure 2-4.
Buttons and Display of BIS-34D
Ringing
The SLAC receives normal ringing on incoming calls. Abbreviated alerting (one short burst
of ringing), accompanied by a change in the LOOP button wink rate, indicates to the
attendant that a held call has exceeded the preset hold time interval. Calls on hold can be
administered to continue on hold after the second timeout or to return to console queue.
Abbreviated alerting can also be administered as a reminder for new calls entering the
queue.
2-30
Attendant Console, Switched Loop
Considerations
One System 25 configuration can support either one or two SLACs or one or two DTACs,
but not a combination of a SLAC and a DTAC.
The optional Direct Extension Selector Console can be connected to a SLAC to provide
busy/idle status of inside stations and quick calling of their extension numbers. In a system
with two consoles, either or both can have a Selector Console as an adjunct. The Selector
Console is covered in the “Attendant Direct Extension Selector Console” feature description.
For information on related Attendant Features (Table 2-E), refer to the individual feature
descriptions.
Interactions
The following features interact with Switched Loop Attendant Console.
Attendant Console, Direct Trunk: The SLAC cannot operate in the same system with a
Direct Trunk Attendant Console.
Bridging of System Access Buttons:
station.
Callback Queuing: The attendant can queue calls that are extended using the normal
START-RELEASE button operation. However, calls originated using only the START button
(no other call put on hold) cannot be queued.
Call Originations:
currently active call. At a console that has the default Automatic Release feature, the active
call is dropped when the attendant presses a new LOOP button. The new loop becomes the
active one; dial tone is provided, and the attendant can dial a number. If the optional
Automatic Hold feature is administered, the interrupted call is put on hold instead of being
lost.
If a new call is originated with the START button or at the Selector Console, the active call is
split. The current loop becomes the active loop for the new call. The display shows the split
call information. This is the normal operating procedure for extending calls.
When a REP DIAL button is pressed while the console is active on a call, the active party is
not dropped or split, and the display does not change. If the active call is with an inside
station, the digits generated by the REP DIAL button are ignored. But if the active call is on
an outside trunk, then pressing REP DIAL will cause the digits stored on the button to be
sent out over the trunk (“thru-dialing” or “end-to-end signaling”).
Placing a new call from an active console causes interactions with the
The SLAC cannot serve as a principal or a bridging
When an active call is put on hold manually by operation of the HOLD button, the system
does not automatically select a new loop for placing a call. In this case, the attendant can
select a new loop by pressing an idle LOOP button, then dial a number. Pressing a DSS, Flex
DSS, Auto Intercom, Last Number Dialed, REP DIAL, or Selector Console button will select a
new loop and dial a number in a single operation.
2-31
FEATURES AND SERVICES
Call Waiting: Calls cannot wait at the SLAC.
Callback Queuing: Calls that are originated without use of the START button can be queued
for busy facilities.
They are treated like calls from standard multiline stations. A queued call
remains on the LOOP button where it was originated and does not return via the common
queue.
Headset Adapter: Connection of a headset adapter to the SLAC allows the optional use of a
headset instead of the handset in handling calls.
Administration Requirements
Attendant Console (Voice Terminal) Port:
● Assign voice terminal type.
● Assign Prime Line Preference to one of the LOOP buttons; default = top LOOP
button.
● Assign flexible buttons.
Trunk Port:
● Assign priorities to calls directed to the console queue.
● Assign the attendant(s) to handle calls from this trunk.
● Assign unique trunk identifiers.
System:
● Assign DID number for attendant “0” treatment.
● Assign Coverage Group number for which the console queue is to serve as a
receiver.
● Assign Automatic Hold or Automatic Release.
● Enable ring reminder when calls enter queue.
● Assign Hold timer interval.
● Assign destination of held calls that time out.
● Assign call types and attendant specification for Message Center-Like operation in a
two-console configuration, if applicable.
● Assign call type priorities and attendant specification.
● Assign Position Busy “backup” station, if applicable.
2-32
Attendant Console, Switched Loop
Hardware Requirements
Each console requires a port on a ZTN79 ATL Station circuit pack.
Figure 2-5 provides a connection diagram for the SLAC.
SYSTEM 25
CABINET
ZTN79
HYBRID
LINE CP
PART OF
OCTOPUS CABLE
C2
PART OF SIP
SIP
ADAPT.
W1
B1
SWITCHED LOOP
C1
ATTENDANT
CONSOLE T1
LEGEND:
– TYPICAL-103A CONNECTING BLOCK*
B1
– MODULAR CORD (D8W-87) - FURNISHED WITH SET
C1
C2 - OCTOPUS CABLE (WP90780) - PEC 2720-05P
T1
- 7305H04C BUILT-IN SPEAKERPHONE (BIS) WITH DISPLAY VOICE TERMINAL - PEC 3162-DIS
OR 7317H01A DELUXE BIS WITH DISPLAY VOICE TERMINAL – PEC 3167-DSB
W1 – 4-PAIR INSIDE WIRING CABLE*
*
–FURNISHED BY INSTALLER
RANGE: WITHIN 2000 FEET OF SYSTEM CABINET
Figure 2-5.
Switched Loop
(LOCAL POWER REQUIRED >1000 FEET)
Attendant Console Connections
2-33
FEATURES AND SERVICES
Attendant Direct Extension Selection
Description
This feature permits the attendant to extend calls to stations by pressing one or two buttons
instead of pressing START and dialing the extension number.
system can have an associated Direct Extension Selector Console. A Selector Console can
be used with either a Direct Trunk Attendant Console (DTAC) or with a Switched Loop
Attendant Console (SLAC).
The Selector Console is also used by the attendant for simply calling inside stations, in
addition to “extending” calls.
The Selector Console (Figure 2-6) has an array of 100 Direct Extension Selection (DXS)
buttons plus seven Group Select buttons and a Test button. The DXS buttons are labeled 00
through 99. Default assignments for the Group Select buttons are 200-299, 300-399, etc., up
to 800-899, but they can be assigned any hundreds group in the dialing plan. To select an
actual extension number, the user presses a Group Select button for the hundreds group
and a DXS button for the last two digits.
Each attendant console in a
Pressing a DXS button when off-hook on an incoming call is equivalent to pressing START
and dialing a station.
Such action will busy out the Start facility until the call is released. The
Selector Console can be used to monitor the on-hook/off-hook status of stations in the
system. If the attendant, while on-hook, presses a Group Select button, the Group Select
LED and the LEDs of any busy stations in that group will light steadily.
The DXS button LED and the Group Select button LED associated with a particular station
will flash when one of the following events occurs:
● The station calls the attendant
● A call extended by the attendant to the station returns on a RTN-BUSY or RTN-DA
button (DTAC only) or on a LOOP button (SLAC only)
● The station is covered and a call to it is redirected to a COVER button (DTAC only) or
to a LOOP button (SLAC only).
The LEDs stop flashing when the call is answered.
When the attendant answers a returning
call, the LEDs will return to the state that reflects the current on-hook/off-hook status of the
station.
In all of the above cases, the Group Select lamp associated with the current
“hundreds page” remains lighted steadily.
An outside call can be parked via the Selector Console by pressing one of the eight DXS
buttons that can be designated as Park extension numbers. On the DTAC, the status LED of
the parked call winks (to indicate that the call is on hold) and the status LED on the Selector
Console lights steadily. On the SLAC, the call is removed from the attendant console, with
the Selector Console LED lit steadily.
A call parked via the Selector Console and not picked up within an administered period (0-
240 seconds; default = 120) will return to the console.
The status LED of the parked-on
button will flash while the call is ringing the attendant.
2-34
Attendant Direct Extension Selection
100 DXS
WITH LEDS
GROUP SELECT BUTTONS
AND ASSOCIATED LEDS
NOTE:
STATUS LEDs are located
to the left of each DXS
button (00-99) under
transparent front cover.
TEST
BUTTON
Figure 2-6.Model 23A1 Attendant Direct Extension Selector Console
2-35
FEATURES AND SERVICES
A call parked via the Selector Console can be picked up at any voice terminal by dialing the
Park retrieval code
The rightmost button on the bottom row is a Test button. When it is pressed, all DXS LEDs
will light sequentially; a second press allows individual LEDs to be tested and a third press
ends the test.
(*8) and the number on which the call is parked.
Considerations
When there are two Attendant Selector Consoles in the system the Group Select button
assignments are identical.
other console is automatically changed.
Buttons on the Selector Console point to either station PDCs, FPDCs (FPDCs), Park codes,
DGC access codes, or pooled facilities. Calls extended by the Selector Console are directed
as described in the “Personal Dial Codes” feature description.
Whenever an administrative change is made to one console, the
When a station calls the attendant, the associated LED on the Selector Console will flash
while the call is ringing and will light steadily when the attendant answers the call. The LED
will light steadily whenever the terminal is off-hook.
for buttons pointing to FPDCs.
If a call to a PDC is directed to a COVER or LOOP button on the Attendant Console, the
covered status LED of the voice terminal on the Selector Console will flash and then go dark
when the call is answered by the attendant. If the covered call was intended for a FPDC that
was signed in at a terminal with attendant coverage, the Selector Console status LED
associated with the FPDC (if assigned) will flash. In this case, the Cover button status LED
will also flash (DTAC only).
A call can arrive at an Attendant Console SYSTEM ACCESS or LOOP button because the
PDC or FPDC is signed in at the Console or because the FPDC is not signed in anywhere.
For these calls, the status LED on the Selector Console will not light.
If the attendant extends a call to a station or DGC group and that call returns to the
attendant, the status LED of the called station or group on the Selector Console will flash
and then go dark when the call is answered by the attendant. This is true regardless of the
sign-in status of the PDC.
Station busy indication is not provided
Interactions
The following features interact with Attendant Direct Extension Selection.
Attendant Position Busy:The Selector Console functions normally when the associated
Attendant Console is in the inactive mode.
Attendant Return-Coverage-On-Busy/On-Don’t-Answer: If a call to a FPDC is returned to the
attendant on a RTN-BUSY or RTN-DA button or on a LOOP button, the status LED of the
FPDC on the Selector Console will flash during ringing and go dark when answered.
2-36
Attendant Direct Extension Selection
Callback Queuing: Callbacks to the attendant do not flash at the associated Selector
Console.
Coverage: If the attendant receives a coverage call for a FPDC, the associated status LED
on the Selector Console will flash and then go dark when the call is answered by the
attendant.
Direct Group Calling: When all stations in a DGC group are busy, the DXS status LED on
the Selector Console lights.
Pooled Facilities: If a 1- or 2-digit FAC is used, the associated status LED on the Selector
Console will light steadily whenever all trunks in this group are busy. This does not occur
with 3- or 4-digit FACs.
Administration Requirements
Special Feature Ports:
● Assign a port on a ZTN79 ATL Station Circuit Pack for each Selector Console.
● Assign Group Select button hundreds groups.
System:
● Assign Selector Console Park codes.
● Park return time (0-240 seconds; default = 120).
Hardware Requirements
Requires an Attendant Selector Console, and a port interface on a ZTN79 ATL Station CP.
The Selector Console requires a KS-22911, List 1 Power Supply, associated 115V ac power
outlet, and a 400 B-type Adapter. The 40062 Adapter provides power to the console at the
wall jack. The Console connects to a port on the ZTN79 ATL Station CP.
Detailed connection information is provided in Figure 2-7. Descriptions of the Station
Interconnect Panel (SIP), Trunk Access Equipment (TAE), and associated cables and
adapters, as shown on the figures, are provided under “Connectivity” in Section 4.
Attendant Direct Extension Selector Console Connections
Attendant Forced Release (SLAC Only)
Attendant Forced Release (SLAC Only)
Description
This feature drops all active parties from a call in which the attendant and one or more other
parties are connected together.
RELEASE button while connected to other callers in a conference-type call. The other parties
will be disconnected from the console and from each other. After Forced Release has taken
place, the attendant can receive a new call from the console queue or place a call.
Considerations
Forced Release differs from Release in an important respect. Simple Release separates the
attendant from an extended call or a conference call, but leaves the other parties connected
together; Forced Release completely disconnects all parties.
When the attendant is connected to only one other party, Forced Release has the same
result as Release (that is, the call is ended). If the attendant has already Released, Forced
Release has no additional effect.
The attendant uses the feature by pressing the FORCED
For information on related Attendant Features (Table 2-E), refer to the individual feature
descriptions.
2-39
FEATURES AND SERVICES
Attendant Join (SLAC Only)
Description
This feature allows the attendant, while extending an incoming call, to connect together the
calling party, the called party, and the console in a 3-way call.
other. The attendant activates the feature by pressing the JOIN
to one of the other parties.
Considerations
The Join feature cancels a split condition.
The attendant can use the Join feature to stay on an extended call and give assistance to the
other parties.
A joined call can be expanded into a conference call by adding more parties.
All parties can talk to each
button while still connected
Once the JOIN button has been pressed, there is no way to “unjoin” the
parties (that is, separate them back into SOURCE and DEST).
For information on related Attendant Features (Table 2-E), refer to the
descriptions.
calling and called
individual feature
2-40
Attendant Message Waiting
Attendant Message Waiting
Description
This feature allows the attendant to remotely control the status of Message LEDs on user
stations. The attendant can activate the Message LED of the station while either (1) ringing,
(2) receiving Busy Tone, or (3) talking to a station. The status of the Message LED of the
called party is reflected by the green status LED of the Attendant Message Waiting button in
any of these cases.
To activate (light) a user’s Message LED in any of these cases, the attendant presses the
Attendant Message Waiting button. (If the signaled voice terminal is not equipped with a
Message LED, the attendant’s LED will remain dark.)
Note:
If the attendant presses the button a second (or third) time before hanging up, the user’s
Message LED will turn Off (and back On), etc.
The red I-Use LED associated with the Attendant Message Waiting button on the DTAC is
inoperative.
The attendant can turn a user’s Message LED on or off without disturbing the user by going
off-hook on a System Access or Loop button, pressing the Attendant Message Waiting
button, and then dialing the station. Confirmation tone is returned, and the user’s Message
LED will turn on. To turn it off, press the button again.
The Attendant Message Waiting button on the Direct Trunk Attendant
Console (DTAC) is labeled ATT MSG. On the Switched Loop Attendant
Console (SLAC), the name is completely spelled out.
Considerations
This feature allows the attendant to notify stations that a message is available for them.
This feature is not the same as the Station-To-Station Message Waiting or the Coverage
Message Waiting features.
summary of all system Messaging Services.
Refer to the “Messaging Services” feature description for a
Interactions
The following features interact with Attendant Message Waiting.
Callback Queuing: An attendant active on a queued inside call can toggle the Message LED
of the queued-for station by pressing the Attendant Message Waiting button.
Conference: Pressing ATT MSG while on a conference call will be ignored.
2-41
FEATURES AND SERVICES
Coverage Calls:
The attendant can light the Message LED of the covered station when
receiving a coverage call for the station.
Hands-Free Answer On Intercom:
If the attendant lights the Message LED on a voice
terminal with AUTO ANS button active, the auto-answer function will turn off, allowing
subsequent calls to receive coverage as assigned.
Administration Requirements
Attendant Console (Voice Terminal) Port:
● The ATT MSG button is defaulted and fixed on SLACs; it is defaulted on DTACs but
can be assigned to any programmable button.
Hardware Requirements
Stations must have a Message indicator (not assignable).
2-42
Attendant Position Busy
Attendant Position Busy
Description
This feature allows an Attendant Console to be placed in an inactive mode.
Systems with Direct Trunk Attendant Console(s) (DTAC)
There must be two Attendant Consoles in the system before this feature can be activated. A
Position Busy (POS BUSY) button can be assigned on each of the consoles. Pressing POS
BUSY at one of two active consoles causes the POS BUSY status LED to light and the
console to be placed in the inactive mode. Pressing POS BUSY a second time causes the
LED to go dark and the console to be reactivated.Pressing POS BUSY when only one
Attendant Console is active is ignored (i.e., only one console is aIlowed to be inactive at a
time.)
When a console is in the inactive mode, ringing is disabled on facility appearances on the
two rightmost button columns only.
normally. Calls to floating PDCs not signed in, DID calls, and dial “0” calls will be
transferred to the active console. Internal calls to the PDC of the inactive console will still be
directed to that console.
The (green) status LEDs will continue to operate
Incoming calls on lines that normally ring at only the inactive console will now ring at the
active console if they have an appearance there.
All buttons on the inactive console will continue to function normally, including the Selector
Console buttons. Calls can be originated by the inactive console. Call appearances in the
leftmost two columns of buttons on the inactive console are not affected by the Position
Busy feature.
The attendant can press a Direct Station Selection (DSS), Automatic Intercom (AUTO ICOM),
or a Direct Facility Access (FACILITY) button and then receive busy-to-idle reminder when
the facility becomes idle.
Note that if a personal trunk appears on only one DTAC, incoming calls on those trunks will
not receive service when the console is inactive. For this reason, it is strongly recommended
that each DTAC attendant be assigned a Coverage-Individual (COVER-IND) button for the
other console so that these calls can be covered. Also, be sure to make the Attendant
Console the principal station (owner) on all trunks that are to receive coverage by the other
attendant.
Systems with Switched Loop Attendant Console(s) (SLAC)
In order for the Position Busy feature to be operational, the system must have either two
attendant positions or one position plus a multiline voice terminal administered as a
“backup.”If the system has two consoles, pressing the Position Busy button on one will
make it inactive and cause most calls in the common console queue to be directed to the
active console. Each attendant covers for the other. Only one console can be in Position
Busy condition at a time. If the system has one console with an administered backup voice
terminal, pressing the POS BUSY button will make the SLAC inactive, and most calls from
the common queue will be directed to the backup terminal.
2-43
FEATURES AND SERVICES
A console in Position Busy mode can receive attendant PDC, DID, and DGC calls, and
outgoing calls can still be placed. Local functions can be activated.
Considerations
Position Busy allows one of two attendant positions to be made inactive when not required.
This is useful in situations where calling traffic requires only one console operator.
Interactions
The following features interact with Attendant Position Busy.
Attendant Call Extending: Unanswered calls extended by an inactive console will return to
the active console on the Return-On-Don’t-Answer (RTN-DA) button (DTAC only) or on a
Loop button (SLAC only).
Attendant Camp-On:Calls Camped-On by an inactive console will return to the active
console when Camp-On timeout occurs.
Attendant Message Waiting:
An inactive attendant is permitted to control voice terminal
Message LEDs.
Automatic Intercom: The inactive attendant is permitted to place Automatic Intercom calls.
DTAC only: Automatic Intercom calls to the inactive attendant will not ring at the console or
be transferred to the active attendant when the AUTO ICOM button is located in one of the
two rightmost button columns
Coverage:
● DTAC only—
If the active attendant is a coverage receiver for the inactive attendant,
coverage is invoked and calls will appear at the active attendant’s Cover button. If
the inactive attendant is a coverage receiver for the active attendant, coverage, when
activated, is invoked at all coverage stations including the inactive attendant.
However, if the Cover button is located in one of the two rightmost button columns,
coverage calls will not ring at these buttons.
● SLAC only—All calls covered by the common queue will be directed to the active
console.
Direct Group Calling: If the inactive attendant is a member of a DGC Group, calls directed to
the group will be routed to the inactive attendant.
The attendant must dial *4 (activate DGC
Group “Make Busy”) to busy out from the group. Dialing *6 deactivates the “Make Busy”
function.
Direct Inward Dialing: All DID calls to unassigned DID numbers will be transferred to the
active attendant.
2-44
Attendant Position Busy
Forwarding:
If a PDC/FPDC is signed in at an inactive attendant console, then calls to this
PDC/FPDC will go to the active attendant (SLAC) or to the inactive attendant (DTAC only).
All calls to FPDCs not signed in will be transferred to the active attendant.
Night Service: An inactive attendant that is a Directed Night Service receiver will receive
Night Service calls.
Park: A call parked on the inactive attendant console will return to the inactive console if the
call times out; calls parked via the Selector Console will return to the active console.
Personal Lines: All calls to trunks having an appearance in either of the two leftmost button
columns of a DTAC will ring normally at the inactive console. All calls to trunks having
appearances in either of the two rightmost button columns will not ring. If these trunks also
have an appearance at the active console, they will ring there even if they do not normally.
Program: The Program feature remains active at the inactive console.
Programmable Buttons:
All DSS, Flex DSS, and REP DIAL buttons remain active on the
inactive console.
Administration Requirements
Attendant Console (Voice Terminal) Port:
● Assign Position Busy button on DTAC. A Position Busy button is defaulted to the
SLAC; it can be assigned to another feature if desired.
● Assign COVER-IND buttons between consoles (DTAC only).
System
● Designate “backup” multiline voice terminal (single-SLAC systems only).
2-45
FEATURES AND SERVICES
Attendant Release
Description
This feature releases the attendant from an extended call. There are two forms of Attendant
Release: Manual and Automatic. This feature applies to the Direct Trunk Attendant Console
(DTAC) and the Switched Loop Attendant Console (SLAC).
Manual Release:
Pressing RELEASE releases the attendant from an extended call and completes the
associated call transfer. The status LED of the original calling facility will change from hold
to busy for direct trunk terminations and from hold to idle for other call facilities {e.g., Loop,
Return-On-Busy, Return-On-Don’t-Answer, Cover,
Access).
Calls cannot be released to Reorder or Dial Tone.
Pressing CANCEL terminates the destination call and reconnects the attendant to the calling
party. If the attendant goes on-hook without first releasing a call, the call extending
operation will be terminated (the calling party will be disconnected).
Automatic Intercom, DSS, and System
Automatic Release:
This feature simplifies the attendant procedures by eliminating the need for the attendant to
press RELEASE when releasing from one call to handle another. Selection of any new line
facility while active on the Start button will automatically release the first call. At release, the
status LED of the first calling facility will change from hold to busy for direct trunk
terminations and from hold to idle for other call facilities (e.g., Loop, Return-On-Busy,
Return-On-Don’t-Answer, Cover, Automatic Intercom, DSS, and System Access).
The Automatic Hold feature can be administered for the SLAC as an alternative to Automatic
Release. if the attendant, active on a loop call, presses another loop button to place a call or
pick up a held call, the active call is put on hold—not released.
Considerations
Attendant Manual Release improves attendant efficiency in handling calls by allowing the
attendant to release an extended call without having to wait for the called station to answer.
Attendant Automatic Release enhances the attendant’s ability to handle many calls by
eliminating the Release operation when answering a second call.
The Release function is inhibited whenever the Start facility is connected to Reorder or Dial
Tone. Pressing CANCEL will terminate the destination call and reconnect the attendant to
the calling party.
Administering the Automatic Hold option instead of Automatic Release reduces the
occurrence of accidentally dropped calls.
2-46
Interactions
The following feature interacts with Attendant Release.
Attendant Release
Attendant Camp-On:
camped on.
External calls that are released when Busy Tone is heard will be
Administration Requirements
System with SLAC: Enable Automatic Hold feature? (yes for Automatic Hold or no for
Automatic Release; default = no).
2-47
FEATURES AND SERVICES
Attendant Return Coverage On Busy
Description
This feature allows a camped-on call at a busy station or DGC Group to be returned to the
attendant for service after a specified time period.
A camped-on call not answered within 1 to 120 seconds (administrable) after the attendant
releases the call will return to the console in one of the following ways:
● On the Return-On-Busy (RTN-BUSY) button at a Direct Trunk Attendant Console
(DTAC).
● On a LOOP button at a Switched Loop Attendant Console (SLAC).
To answer a returned call at a DTAC, the attendant presses RTN-BUSY (if not selected by
Ringing Line Preference.) A returned call can be reextended via the START button or a
Selector Console button. In either case, the Return-On-Busy button is idled as soon as the
attendant releases.
To answer a returned call at a SLAC, the attendant merely lifts the handset to be connected
to the ringing loop.
When the RTN-BUSY button is busy at a DTAC, the calling party will remain on-hold; if a loop
is not available at a SLAC, the returning call remains in the console queue. The system will
continue to attempt to ring the called station until the RTN-BUSY button is idle or a loop is
open. When Attendant Camp-On is not provided (Camp-On return time set to zero seconds),
calls released by the attendant to busy tone are returned to the console immediately.
Considerations
Attendant Return-Coverage-On-Busy allows the attendant to service calls not answered
within specified time intervals.
This provides the calling party better service, and results in
fewer lost calls.
Interactions
The following features interact with Attendant Return Coverage On Busy.
Attendant Camp-On:
camped on.
Attendant Console, Direct Trunk: As long as an Attendant Console remains active, the call
will return to the attendant who extended it.
External calls that are released when Busy Tone is heard will be
Attendant Console, Switched Loop: A returning call is directed from the common queue to a
LOOP button. In a two-console system, returning calls can be administered to go to the first
attendant, the second attendant, either attendant, or to the specific attendant who originated
the call.
2-48
Attendant Return Coverage On Busy
Attendant Direct Extension Selection: If a call to a Floating PDC (FPDC) is returned to the
attendant, the FPDC’s status LED on the Selector Console will flash during ringing and go
dark when the call is answered.
Direct Group Calling: External calls that are camped onto a DGC group that does not have a
delay announcement will return to the attendant console after the specified number of rings.
Send All Calls DTAC only): If Send All Calls is activated, returning calls will ring at the
DTAC.
Administration Requirements
System:
● Assign number of seconds before unanswered camped-on calls return to the
Attendant Position (1-120 or 0 for no Camp-On; default = 30),
2-49
FEATURES AND SERVICES
Attendant Return Coverage On Don’t Answer
Description
This feature allows unanswered calls extended by the attendant to be returned to the
attendant for additional service.
Calls that are not answered after a administered number of rings will transfer ringing to the
Return-On-Don’t-Answer (RTN-DA) button on a Direct Trunk Attendant Console (DTAC) or to
a LOOP button on a Switched Loop Attendant Console (SLAC). If the called voice terminal
has Coverage, the counting of rings for return begins only after the coverage station begins
ringing. If the terminal does not have Coverage but does have delayed ringing on System
Access or Bridged Access buttons, the delay interval (administered as an equivalent number
of rings) must expire before counting begins.
When the RTN-DA button is busy, calls will continue to ring at the called station until the
button is idle. If a SLAC is not available to receive the returning call, it stays in the common
queue until it can be serviced.
To answer a returned call at a DTAC, the attendant presses RTN-DA (if not selected by
Ringing Line Preference.) The call can be reextended via the START button or Selector
Console. In either case, the RTN-DA button is idled as soon as the attendant releases.
To answer a returned call at a SLAC, the attendant merely lifts the handset to be connected
to the ringing loop.
Considerations
Attendant Return-Coverage-On-Don’t-Answer allows the attendant to service calls not
answered within a specified number of rings. This provides the calling party better service
and results in fewer lost calls.
Interactions
The following features interact with Attendant Return Coverage on Don’t Answer.
Attendant Console, Direct Trunk: As long as an Attendant Console remains active, the call
will return to the attendant who extended it.
Attendant Console, Switched Loop: A returning call is directed from the common queue to a
LOOP button. In a two-console system, returning calls can be administered to go to the first
attendant, the second attendant, either attendant, or to the specific attendant who originated
the call.
Attendant Direct Extension Selection: If a call to a Floating PDC (FPDC) is returned to the
attendant, the FPDC’s status LED on the Selector Console will flash during ringing and go
dark when the call is answered.
2-50
Attendant Return Coverage On Don’t Answer
Coverage:
● DTAC only—Whenever a DTAC attendant is a coverage receiver for a particular
coverage group and a call is placed from the attendant position via the Start button
or the Selector Console to a voice terminal in that group, the Coverage-Group
(COVER-GRP) button on the Attendant Console will not track the call (COVER-GRP
button status LED will not flash). If the call remains unanswered, it will return to the
Attendant Console on the RTN-DA button rather than the COVER-GRP button.
● SLAC only—Whenever the common queue is a receiver for a coverage group and a
call is placed from the attendant position via the START button or the Selector
Console to a voice terminal in that group, an unanswered call will return to
attendant queue as a Return-On-Don’t-Answer call (instead of as a coverage call)
the
Send All Calls (DTAC only): If Send All Calls is activated, returning calls will ring at
DTAC.
Administration Requirements
System:
● Assign number of rings before call return to the Attendant Position (1-31; default =
5).
the
2-51
FEATURES AND SERVICES
Attendant Source and Destination (SLAC Only)
Description
This feature allows the attendant, while extending a call, to switch back and forth between
the calling party (the source) and the called party (the destination) before connecting them
together.
Pressing the SOURCE button on the SLAC after the called party has been reached has these
results:
● The called party (the destination) is put on hold.
● The attendant is reconnected to the calling party (the source).
● The green status lamp of the DEST button starts winking to indicate that the
destination is on hold.
● The green status lamp of the SOURCE button goes from winking to dark.
Pressing the DEST button after the source has been reconnected has these results:
● The source is put on hold (again).
● The attendant is reconnected to the destination.
● The green status lamp of the SOURCE button starts winking to indicate that the
source is on hold.
● The green status lamp of the DEST button goes from winking to dark.
Considerations
The Source/Destination feature is useful when the attendant needs to talk to each party
privately before connecting them.
Interactions
The Source/Destination feature can only be activated before the two parties are connected
together.
When the attendant presses JOIN, the other parties and the attendant are joined in a 3-way
connection. When the attendant presses RELEASE, the other parties are connected, the call
is separated from the console, and the attendant is free to handle other calls. After the
source and destination parties are connected together, the SOURCE and DEST status lamps
go dark.
2-52
Attendant Splitting One-Way Automatic
Attendant Splitting One-Way Automatic
Description
This feature allows the attendant to converse privately with a called party while the calling
party is split away on hold.
When the attendant presses START (or a DXS button) to extend an incoming call to a called
party, the calling party is automatically split away from the connection and placed on hold.
This allows the attendant to talk privately with the called party before extending the call. The
attendant can then press RELEASE to complete the transfer or CANCEL to drop the called
station and return to the incoming call.
If the console is a SLAC, the attendant can also use the Join and Source/Destination
features while in the Start mode. Refer to the descriptions of these features for details.
Considerations
Attendant Splitting One-Way Automatic allows the attendant to (1) announce a call, (2)
determine privately whether the called party is available to receive the call, and (3) obtain
information if necessary to redirect the call or take a message.
Interactions
The following features interact with Attendant Splitting One-Way Automatic.
Attendant Source/Destination (SLAC only): This feature can be used after reaching the
called party. It allows the attendant to speak privately to both the calling party and the called
party before connecting them together.
Music-on-Hold: Music-on-hold is not provided to the calling party while the call is split from
the console.
2-53
FEATURES AND SERVICES
Attendant System Alarm Indication
Description
This feature provides a visible alarm on the Attendant Console to alert the attendant to
problems detected by the system software.
flash whenever a detected fault persists longer than four minutes, or if more than five
transient faults per hour are detected. The alarm indication should be reported immediately to
your AT&T Systems Technician.
The alarm type that causes an alarm indication is referred to as a Permanent System Alarm.
These alarms are faults that can cause degradation of service and require immediate
attention.
If a flashing ALARM button is pressed, the LED will change from flashing to steadily lit. A
new trouble situation will cause a steady ALARM LED to start flashing again. Only when the
trouble has been corrected will the LED turn off.
The ALARM LED on the Attendant Console will
Considerations
The ALARM LED on the Attendant Console provides a warning as soon as the fault is
detected. This permits a quick response to system detected faults.
In a two-attendant system, both consoles track problems.
2-54
Automatic Intercom
Automatic Intercom
Description
This feature allows a multiline voice terminal user (or attendant) to place and answer calls to
and from another station by use of a dedicated button appearance.
Automatic Intercom provides a private path between two designated multiline voice terminals.
To place an Automatic Intercom call, the calling party presses the Automatic Intercom (AUTO
ICOM) button and goes off-hook. The calling party hears ringback tone and the called party
receives standard ringing. The status LED associated with the button is steadily lit at the
calling voice terminal and flashing at the called voice terminal. To answer an Automatic
Intercom call, the called party presses AUTO ICOM (not necessary with Ringing Line
Preference) and goes off-hook.
The AUTO ICOM status LED lights steadily whenever the other party is off-hook. This
provides each party with a station-busy indication for the other. To activate the busy-to-idle
reminder, the user can press AUTO ICOM (remaining on-hook). A short burst of tone is
provided when the other party goes on-hook.
will be placed; the user does not press the AUTO ICOM button again.
The user can then go off-hook, and the call
Pressing AUTO ICOM to invoke the busy-to-idle reminder overrides Prime Line Preference.
Once activated, the feature can only be canceled by preelection of another button or
answering an incoming call. See the “Busy-to-Idle Reminder” feature description for more
information.
At a Switched Loop Attendant Console, operation of an AUTO ICOM button seizes an idle
loop button for the outgoing call. An incoming Automatic Intercom call arrives on a loop
button and does not flash at the AUTO ICOM button of the console.
Considerations
The intercom feature should not be confused with ordinary station-to-station calling inside
the system using dialed PDCs.
other can do so by pressing one button instead of dialing a PDC. In addition, the station-
busy indication and busy-to-idle reminder provide additional utility to users.
This feature is similar to Direct Station Selection (DSS), except that the buttons must always
be assigned in pairs (i.e., between two sets.) Hence, an AUTO ICOM button cannot point to
a single-line set.
providing calling party ID; DSS calls arrive on System Access buttons.
Also, Automatic Intercom calls arrive at the AUTO ICOM button, thereby
With Automatic Intercom, users who frequently call each
2-55
FEATURES AND SERVICES
Interactions
The following features interact with Automatic Intercom.
Attendant Position Busy: The inactive attendant is permitted to place Automatic Intercom
calls. Automatic Intercom calls to an inactive DTAC where the AUTO ICOM button is located
in one of the two rightmost button columns will not ring at the console, nor can they be
covered by the active attendant. However, Automatic Intercom calls to an inactive SLAC will
ring there.
Bridging of System Access Buttons: Calls on Automatic Intercom buttons on the principal
station are not accessible from bridged call appearances on the bridging station.
Coverage: Automatic Intercom calls are considered private and do not receive coverage.
Direct Group Calling: Automatic Intercom calls cannot be directed to DGC groups.
Exclusion: Any attempt to engage Exclusion while active on an Automatic Intercom call will
drop the other party.
Last Number Dialed: Numbers called using an AUTO ICOM button are not saved by the Last
Number Dialed feature.
Line Selection (Prime Line Preference): When the Automatic Intercom line is assigned Prime
Line status, the AUTO ICOM button must be pressed to activate the busy-to-idle reminder
even though the I-use LED is already lighted steadily.
Pickup: When an Automatic Intercom call is answered via the Pickup feature, the AUTO
ICOM status LED on the called voice terminal lights steadily. The called party can press
AUTO ICOM to enter the call at any time.
Administration Requirements
Voice Terminal Port:
● Assign AUTO ICOM buttons to voice terminals in pairs. Voice terminals can have
several AUTO ICOM buttons assigned for direct access to multiple stations.
2-56
Automatic Route Selection (ARS)
Automatic Route Selection (ARS)
Description
This feature provides for the routing of calls over the telecommunications network based on
preferred routes (normally the least expensive route available at the time the call is placed.)
An ARS pattern can be composed of two subpatterns (time of day determines which
subpattern is selected), each consisting of up to three routes, associated Facility Restriction
Level (FRL) codes (described below), and CO overflow flags. A route is identified by
specifying a Facility Access Code for the pooled facility (trunk group); a route may also be
identified by specifying a Virtual Facility code.
A trunk group or virtual facility can be used in more than one ARS pattern and more than
once within a pattern.
Call routing can be specified by as many as eight routing patterns. Each pattern contains a
sequential list of routes (for example, trunk groups) the system can use to complete a call.
Number translations (deletion and addition of dialed digits) necessary to route the call is
determined on a trunk group basis. Overflow to the local CO when all trunks in a pattern are
busy or the route FRL is too high is optional. If all trunks in a pattern are busy (including CO
trunks if overflow is allowed), the call may be queued (via the Callback Queuing feature) on
the first route in the pattern.
All calls placed using the ARS access code (default = 9) are routed via the feature. The
dialed numbers that follow the ARS access code are generally seven or ten digit DDD
numbers preceded by a “ 1‘’ if required by the serving Central Office. Numbers preceded by
a “0” are routed over the local CO pooled facility.
Typically, a dialed 7-digit number consists of a CO code and exchange number in the form
NXX-YYYY where N = 2-9, X = 0-9, and Y = 0-9. A 10-digit number consists of an area
code, CO code, and exchange number in the form NPA-NXX-YYYY where N = 2-9, P = 0-1,
A = 1-9, X = 0-9, and Y = 0-9.
Each route in a pattern has an associated FRL (0-3), This FRL may differ each time the
facility is specified as a route. A facility with a FRL of “0” is least restricted to callers; a
FRL of “3” is the most restricted. Similarly, each station in the system is assigned an FRL
(0-3). A terminal assigned an FRL of “0” has the least ARS privileges (i.e., routes with FRLs
of 1-3 are restricted); a FRL of “3” provides the most privileges. To use a route, a station’s
FRL must be equal to or greater than the route’s FRL.
The ARS feature, when accessed, selects a pattern as follows:
● Emergency Number Calls (routed via the local CO facility)
● Service Code (N11) Calls (routed via an associated routing pattern)
● International Calls (routed via the administered international pattern)
2-57
FEATURES AND SERVICES
● Calls made to specified COs or seven digit telephone numbers within the Home
Number Plan Area (HNPA). These calls are routed as specified in the HNPA
Exception Lists, or else via the NPA Routing Table or (by default if not otherwise
specified) the local CO facility.
● Calls made to NPAs outside the HNPA, sometimes referred to as Foreign NPAs
(FNPAs). The route selected depends on the type of call, as follows:
FNPA special number calls (includes all “800”, “900”, and Telex 510, 610,
710, and 810 numbers). Each FNPA of the form N00 and N10 may be
assigned to a routing pattern.
—
FNPA calls made to numbers specified in the FNPA Exception List.
—
All other FNPA calls.
ARS Flow Chart
Figure 2-8 provides a simplified ARS flow chart.
Bracketed numbers (e.g., [401], [601])
provide a link between ARS administrable action numbers and the associated item on the
flow chart. Certain readers may find this reference useful when reading the following
description in association with the System 25 Administration Manual. Administrable System,
Station, Toll Allowed, and Trunk action numbers are also noted where applicable.
The ARS feature is accessed when a user dials the ARS access code. As shown on Figure
2-8, the number dialed is first checked against the Emergency Numbers List. This list
consists of special service code 911 and up to three customer-defined seven digit numbers.
If the number dialed matches one of the numbers on the list, the call is immediately routed
via the local CO facility. All user call restrictions are disregarded.
If the number dialed is not on this list, a check is made to determine if the terminal is allowed
to originate outside calls.
If the terminal is outward restricted, the caller receives Reorder
Tone; otherwise, the dialed number is checked against any toll restrictions that apply.
Terminals may be assigned a Toll Restriction Class (1-4), or be unrestricted (Class 0).
Terminals assigned Toll Restriction Class 1 have the most privileges, those assigned Class 4
have the least privileges.
There are four associated Toll Call Allowed Lists (1-4) in the
system. Up to 64 3-digit CO codes and 6-digit NPA plus CO codes may be divided among
the four lists.
Numbers dialed from voice terminals assigned Toll Restriction Class 1 are checked against
all four Toll Call Allowed (TCA) Lists;
numbers dialed from Class 2 terminals are checked
against TCA Lists 2-4; numbers dialed from Class 3 terminals are checked against TCA Lists
3-4; and numbers dialed from Class 4 terminals are checked against List 4 only. If the
number dialed does not appear on a list, the user receives Reorder Tone. Calls originated at
unrestricted (Class 0) terminals are not screened.
Calls are checked to determine if they are international calls or operator calls. Dialed
numbers “01” or “011” signify international calls, “0” plus a number other than “1” signify
operator calls (00 calls signify lntra-Lata operator calls). If the call is an international call, the
international routing pattern is selected and the call routed accordingly. Operator calls are
2-58
Automatic Route Selection (ARS)
routed via the local CO facility.
Calls within the HNPA are checked to determine if a special N11 service code (N = 2-8) has
been dialed. Dialed N11 codes assigned a routing pattern are routed via the routing pattern.
All other call types are checked against the HNPA Exception Lists. There may be up to four
of these lists, each with an associated ARS Routing Pattern. Up to 800 3-digit office codes
may be divided among the four lists (eight entries may be 7-digit numbers.) If a match is
found, the call is routed via the associated ARS Routing Pattern. If no match is found the
dialed number is routed via the HNPA pattern (specified in the NPA Routing Table), or if none
is specified, via the local CO facility.
If a number is entered more than once in the exception list, the pattern used will be the
pattern associated with the more specific number.
The NPA Routing Table is simply a listing of North American Plan NPAs and Special Number
NPAs, each having an associated ARS Routing Pattern (all North American NPAs are
assigned routing pattern 1 by default). A dialed NPA that is listed in the table is routed using
the associated Pattern. Calls to NPAs not listed are routed via the local CO facility.
The dialed numbers are checked against the FNPA Exception List. Up to 32 entries may be
assigned to the list. Each entry must consist of a 3-digit NPA code, 3-digit CO code, and two
additional digits (for a total of 8 digits). The last two digits may be “.”, which match any digit.
Each entry has an associated ARS Routing Pattern.
using this pattern. If no match is found, the call is then checked against the NPA Routing
Table. A dialed NPA that is listed in the table is routed using the associated Pattern.
Numbers that don’t match are routed via the local CO facility.
ARS Routing Pattern Table
Figure 2-9 provides a block diagram of an ARS Routing Pattern. Up to eight of these
patterns may be administered in the system. Each pattern consists of two subpatterns that
may be chosen based on the time of day. Each subpattern (A and B) can contain up to three
allowed routes. If all routes in a subpattern are busy, a CO overflow flag (when set) allows
the call to be routed via the local CO facility; otherwise, the call will queue on the first route
in the subpattern.
Administrable Start and Stop times (Hour and Minute) for Routing Subpattern A specify when
Subpattern A should be used to route calls. Subpattern B is used to route calls at all other
times.
Each route is specified by its trunk group facility access code or Virtual Facility code and an
associated FRL.
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 a match is found, the call is routed
2-59
FEATURES AND SERVICES
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 NPA and
the NPA 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:
● Confirmation—Indicates that a queued call is being serviced (trunk available to route
call)
● Busy—Indicates that the called number is busy
● 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 make 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:
● Emergency Numbers List: 911, and up to three customer-defined, 7-digit numbers.
● Service Codes (N11 Numbers): An ARS Routing Pattern can be assigned to each
N11 (N = 2-8) Service Code.
that the N11 number is a local CO code and will wait for four additional digits to be
dialed before processing it as a local call.
● Toll Call Allowed Lists: 1-4 lists, 64 entries maximum between all lists. Entries may
be 3-digit CO codes or 6-digit NPA plus CO codes. (Administrable for uses besides
ARS)
● Station Toll Restriction Class: 1-4 Classes (Administrable for users besides ARS)
● HNPA Exception List: 1-4 Lists: each with an associated ARS Routing Pattern. 800
3-digit CO codes entries maximum between all lists (eight of the entries may be 7digit numbers.)
● NPA Routing Table: Entries may include every North American NPA and Special
Number NPAs, each with an associated ARS Routing Pattern. All NPAs are assigned
Routing Pattern #1 by default.
If no routing pattern is assigned, the system assumes
2-60
Automatic Route Selection (ARS)
● FNPA Exception List: One List with up to 32 eight-digit numbers. Each entry has an
associated ARS Routing Pattern.
● Digit Translations Tables: One per trunk group or Virtual Facility.
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:
● On-hook ARS queuing is allowed.
● Callback Queuing and ARS share a common queue, which has a capacity of 64 calls.
● 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.
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.
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:
● Specify your area code (HNPA).
● Specify whether “Dial 1”
● Specify whether “Dial 1” is needed for toll calls within of your area code.
is needed for calls outside of your area code.
2-61
FEATURES AND SERVICES
ARS:
● ARS Access Code (1-9999; default = 9).
● International ARS Routing Pattern Number (1-8; no default).
● Three Emergency Numbers Lists (7-digit numbers; no default).
● NPA Routing Table (NPA code and associated pattern number 1-8; default = 1).
● N11 Routing Table (N11 code and associated routing pattern number 1-8 or 0 if this
code is a valid CO exchange requiring four additional digits to complete; no default).
● HNPA Exception List:
— List Number (1-4).
— Pattern Number (1-8).
—
Exception Numbers (NXX or NXX-YYYY). Last three digits may be “.”
● FNPA Exception Telephone List:
— Pattern Number (1-8).
—
Telephone Number (8-digits in the form NPA-NXX-YY; last two digits may be
“.”).
● Digit Translations Table:
—
Trunk Group Facility Access Codes (1-9999) or Virtual Facility Codes (#190-
#199).
— Associated NPA (NPA).
—
Number of digits to remove for calls within associated NPA (1-10 digits,
none).
—
Digit pattern to add for calls within associated NPA (maximum of 5 digits;
default = none).
—
Number of digits to remove for calls not in associated NPA (1-10, none;
default = none).
—
Digit pattern to add for calls not in associated NPA (maximum of 5 digits;
default = none).
● ARS Routing Pattern:
— Pattern Number (1-8).
2-62
— 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:
● ARS FRL Level (0-3).
Automatic Route Selection (ARS)
2-63
FEATURES AND SERVICES
STATION USER
DIALS ARS
ACCESS CODE
[401]
NUMBER DIALED
ON EMERGENCY
NUMBERS LIST
(911, AND
THREE CUSTOMER
DEFINED 7-DIGIT
NUMBERS
[ 601 -603]
YES
VOICE TERMINALS
“RESTRICT
OUTWARD
CALLS” = YES
YES
NO
VOICE TERMINAL
ASSIGNED TOLL
RESTRICTION
CLASS 1-4
YES
RECEIVES SYSTEM
REORDER TONE
NO
NUMBER DIALED
INTERNATIONAL,
OPERATOR, OR
OTHER
OPERATOR
INTERNATIONAL
ROUTE CALL
VIA
INTERNATIONAL
ROUTING
PATTERN
[402]
OTHER
(SHEET 2)
2-64
Figure 2-8.
Automatic Route Selection Flow Chart (Sheet 1 of 2)
FROM
SHEET 1
NUMBER DIALED
WITHIN HOME
NPA?
OUTSIDE HOME
NO
NPA (FNPA)
NUMBER DIALED
ON FNPA
NO
EXCEPTION
LIST
Automatic Route Selection (ARS)
CALL ROUTED
VIA ASSOCIATED
ROUTING PATTERN
SYSTEM [30]
YES
SPECIAL N11
SERVICE CODE
DIALED
[ 900]
NO
NUMBER DIALED
ON HOME NPA
EXCEPTION
LISTS
[500]
YES
YES
HOME AREA CODE
NO
ON NPA ROUTING
TABLE [300]
CALL ROUTED
VIA LOCAL
CO FACILITY
CODE HAS AN
ASSIGNED
ROUTING
PATTERN
[901]
NO
NO
NO
AREA CODE ON
NPA ROUTING
TABLE [300]
CALL ROUTED
YES
VIA ASSOCIATED
ROUTING
PATTERN
YES
CALL ROUTED
VIA ASSOCIATED
ROUTING PATTERN
CALL ROUTED
YES
VIA ASSOCIATED
ROUTING PATTERN
Figure 2-8.
Automatic Route Selection Flow Chart (Sheet 2 of 2)
2-65
FEATURES AND SERVICES
ROUTING SUBPATTERNS (RSP) A AND B
RSP A ROUTE 1 ROUTE 2
START/
STOP
ROUTING
PATTERNS
(1-8)
[100]
[200] [211]
TIME
[101] ,
[ 102]
RSP B
POOLED
FACILITY
ACCESS
CODE
[110]
FRL (0-3)FRL (0-3)FRL (0-3)FRL (0-3)
[111]
ROUTE 1
POOLED
FACILITY
ACCESS
CODE
FRL (0-3) FRL (0-3) FRL (0-3) FRL (0-3)
DIGIT TRANSLATIONS
TABLE ASSOCIATED
WITH POOLED FACILITY
OR VIRTUAL FACILITY.
DELETE DIGITS (0-10)
ADD DIGITS (MAX 5)
POOLED
FACILITY
ACCESS
CODE
[120]
[121]
ROUTE 2
I
POOLED
FACILITY
ACCESS
CODE
[221]
ROUTE
SELECTED
[700S]
ROUTE 3
POOLED
FACILITY
ACCESS
CODE
[130]
[131]
ROUTE 3
I
POOLED
FACILITY
ACCESS
CODE
[221] [241]
CO
OVERFLOW
FLAG
[140]
[141]
CO
OVERFLOW
FLAG
ALL ROUTES
BUSY
ROUTE CALL
VIA DDD
NETWORK
YES
ON
ROUTE 1
2-66
Figure 2-9.
Automatic Route Selection Routing Pattern
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:
● Principal station
—a multiline voice terminal that has SA buttons bridged by one or
more other multiline stations.
● Principal—the user of a principal station.
● 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.
● 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 an SA button. The SA buttons on the bridging station can be
bridged by other stations.
❑
SYS ACC
❑ 3021
❑
SYS ACC
❑ 3021
❑
❑
❑
❑
❑
❑
❑
—
❑
❑
—
❑
❑
❑
❑
❑
❑
❑
❑
SYS ACC
❑ 3022
❑
SYS ACC
❑ 3022
❑
BRIDGE
❑ 3021
❑
BRIDGE
❑ 3021
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
I
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.
2-67
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 an 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:
● The number of principal stations is limited only by the number of multiline sets on the
system.
● The number of SA buttons a principal station can have is limited only by the number
of available buttons on the terminal.
● Each SA button on a principal station can have a bridged call appearance on up to
16 multiline voice terminals.
● The number of principals for which a station has bridged call appearances is limited
only by the number of available programmable buttons.
● 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.
not send, ringing to the bridging station;
immediate ring, delayed ring, or no ring for incoming calls.
The principal station can be administered to send, or
both stations can be administered to receive
Table 2-F summarizes the effect
of different settings for these ring options.
Table 2-F.
Bridged Ringing Options
Bridging Station
Principal Station
Administered to send
ring on no answer?
Administered to send
ring on busy?
yes
no
yes
no
No Ring
Immediate Ring
AdministeredAdministered
no ringimmediate ringdelayed ring
no ring
no ring*
no ringimmediate ringdelayed ring
no ring
no ring*
Delayed Ring
Administered
no 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 an 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
2-68
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
parties place and receive calls on the
complete coverage of all incoming calls.
answering patterns.
It is recommended that each SA button at a principal station have a corresponding BA button
at the bridging station.
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.
With this arrangement, the bridging user can track all calls coming to
executive/secretary type arrangements where both
same extension numbers. Bridging allows more
It provides options that can enable several call-
Interactions
The following features interact with Bridging.
Abbreviated Ringing: When a call arrives on an SA button of the principal, off-hook
stations—
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.
principal and bridging
—that have bridged ringing enabled receive abbreviated
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
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