ATT System 25 Reference Manual

OVERVIEW
l The integrated voice-data dialing plan recognizes the different types of data
endpoints (digital/analog and remote/local) 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.
l Station Hunting supports the use of a single dial code to access a group of host
computer ports.
l Terminal Dialing provides the user with fast access to data communications...

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.
l Advanced Administration (optional) is an easy-to-use, menu driven personal computer
software package for...

OVERVIEW
l 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.
l Off-Premises Stations (OPS) allow single-line voice terminals and key systems 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...

FEATURES AND SERVICES
Introduction
Account Code Entry, Forced
Account Code Entry, Optional
Attendant Call Extending
Attendant Camp-On
Attendant Cancel
Attendant Console, Direct Trunk
Attendant Console, Switched Loop
Attendant Direct Extension Selection
Attendant Forced Release (SLAC Only)
Attendant Join (SLAC Only)
Attendant Message Waiting
Attendant Position Busy
Attendant Release
Attendant Return Coverage On Busy
Attendant Return Coverage On Don’t Answer
Attendant Source and Destination (SLAC Only)...

Call Accountability
Call Accounting System (CAS)
Callback Queuing
Calling Restrictions
Call Management System (CMS)
Call Progress Tones
Call Waiting
Command Mode
Communications Access Manager (CAM)
Conference
Conference Drop
Coverage, Group
Coverage, Individual
DS1 Facility Interface
Data Call Setup
Data Services Overview
Data Terminal Dialing
Dial Access to Message Waiting Indicators
Dial Plan
Dictation System Access
Digital Tape Unit (DTU)
Direct Group Calling (DGC)
Direct Group Calling Delay...

Directory
Direct Station Selection (DSS)
Display
Distinctive Ringing
End-To-End Signaling
Exclusion
Expert Mode
Extended Stations
External Alerts
Following
Forwarding
Hands-Free Answer on Intercom (HFAI)
Headset Adapter Adjunct
Hold
Inspection
Integrated Solution (IS)
Intercept Treatment With Reorder Tone
Interdigit Timeouts
Last Number Dialed
Leave Word Calling
Line Selection
Line Status and I-Use Indications
Local Display
Manual Signaling2-155
2-158
2-160
2-171
2-172
2-173
2-175
2-178
2-179
2-182...

Message Center-Like Operation (SLAC Only)
Messaging Services
Modem Pooling
Music-On-Hold
Night Service
Night Service Delay Announcements
Off-Premises Stations (OPS)
Out-of-Building Stations
Paging System Access
Park
Personal Dial Code (PDC)
Personal Lines
Pickup
Pooled Facility - Dial Access
Pooled Facility - Direct Access
Power Failure Transfer (PFT)
Program
2-225
2-227
2-230
2-233
2-237
2-240
2-242
2-243
2-244
2-244
2-252
2-254
2-256
2-258
2-260
2-262
2-267
Recall
Remote Access
Remote Administration...

Speakerphone Adjunct
Speed Dialing
STARLAN NETWORK Access
Station Hunting
Station Message Detail Recording (SMDR)
Station-To-Station Message Waiting
System Administration
System Maintenance
Tandem Trunking
Test
Third-Party Call Setup
Tie Trunks
Touch-Tone and Dial Pulse Services
Transfer
Transfer To Data
Trunk Groups
Trunk-To-Trunk Transfer
User Changeable Options
Virtual Facilities
AUDIX Voice Power System2-285
2-291
2-294
2-302
2-304
2-317
2-318
2-328
2-330
2-332
2-333
2-337
2-340
2-341
2-344
2-346...

Figures
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Figure 2-16.
Figure 2-17.
Figure 2-18.
Figure 2-19.
Figure 2-20.
Figure 2-21.
Figure 2-22.
Figure 2-23.
Figure 2-24.
Figure 2-25.Typical Direct Trunk Attendant Console Position2-19
Direct Trunk Attendant Console Connections                                2-23
Typical Switched Loop Attendant Console Position
2-24...

Figure 2-26.
Figure 2-27.
Figure 2-28.
Figure 2-29.
Figure 2-30.
Figure 2-31.
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Figure 2-33.
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Figure 2-42.
Figure 2-43.
Figure 2-44.
Figure 2-45.
Figure 2-46.
Figure 2-47.
Figure 2-48.
Figure 2-49.
Figure 2-50.
Figure 2-51.External Alert Connections                                          
Supplemental Alert Adapter Connections                       
Stages of Call Forwarding...