ATT System 25 Single Line Telephone User Guide

555-540-702
Issue 1
1989
AT&T System 25
Single-Line Telephone
User Guide 

©1989 AT&T
All Rights Reserved
Printed in USA
TO ORDER COPIES OF THIS DOCUMENT REFER TO DOCUMENT
NUMBER 555-540-702.
Contact:
Call:
Write:Your AT&T sales representative, or
800-432-6600, Monday to Friday between 7:30 am
and 6:00 pm EST.
In Canada call: 800-255-1242, or
AT&T Customer Information Center
2855 North Franklin Road
P.O. Box 19901
Indianapolis, Indiana 46219
Every effort was made to ensure that the information in this document
was complete and accurate at the time of printing. However, this...

Contents
Introduction
5
27
Single-Line Features
Account Code Entry
Call Accountability
Call Waiting
Callback
Conference Calls
Direct Group Calling (DGC)
Following
Forwarding
Hold
Leave Word Calling
Message Waiting
Night Service
Paging
Park
Pickup
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7
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9
10
11
12
13
14
15
16
17
18
19
20
Placing Calls21
Programming Speed Dialing Codes22
Speed Dialing25
Transfer26
Glossary 

Introduction
This guide describes the features available to you from AT&T
System 25 through a single-line telephone and provides
instructions for using the features. For your convenience, the
features are arranged in alphabetical order.
Your telephone is ready to use as soon as it is connected to the
System 25. Therefore, as you learn to use the features, you can
make and receive calls with your telephone just as you would
with an ordinary phone.
System 25 supports both touch-tone and rotary sets....

The Switchhook
The switchhook is the button held down by the handset when it
rests in the cradle on your telephone. Some System 25 features
require that you use the switchhook to signal the system.
When you are instructed to press the switchhook, press the
button down as far as it will go for approximately 1/2 second and
then release it. If the switchhook is released too soon, the signal
will not work. If you hold the switchhook down for too long
your call will be disconnected.
If you want to hang up and...

Handset Tones
System 25 signals you with tones that are heard through the
handset. The tones and their descriptions are listed below.
DIAL TONE 
lllllllllllllllllllllllllllllllllllllllllllllllllIll (a continuous steady tone)
You can dial.
CONFIRMATION TONE 
II II II (three short tones)
Your action has been accepted.
RINGBACK TONE 
IIIIIIIIIIIIIII IIIIIIIIIIIIIII (repeating on/off tone)
The number you dialed is ringing.
SPECIAL RINGBACK TONE 
IIIIIIIIIIIIIIIII II (one long tone and
one short, dull tone)...

Data Dial Code (DDC)
When your System 25 was installed, Data Dial Codes (DDCSs)
were assigned to data terminals. If you have a data terminal
associated with your System 25, you will receive separate
information regarding its use.
Personal Dial Code (PDC)
Personal Dial Codes (PDCs) were assigned to telephones. In
most cases, your PDC is your extension number. If a telephone
is shared by two or more people, each person may have been
assigned their own“floating” extension number (FPDC).
Additional...

Single-Line Features
Account Code Entry
For bookkeeping purposes, your System Administrator may
assign account codes to use with certain calls. If you are
required to use account codes for outgoing calls, the account
code must be entered before you can place an outgoing call. If
this feature is not mandatory, you may still use the Account
Code Entry feature.
See your System Administrator to verify the types of calls, if
any, for which you must enter an account code.
Account Code Entry - Outgoing Calls
1...

Account Code Entry (Continued)
Account Code Entry - Incoming Calls
Your call will be disconnected when you follow this procedure.
Therefore, do not attempt it until you have finished your
conversation.
1
2
3
 4 
5
After you have completed your conversation, and before you
hang up, press the switchhook.
Listen for confirmation tone and dial tone.
Dial *  0 .
q q
Dial the account code.
NOTE: If you make a mistake while entering the account
code, dial *   0 again and then the account code.
q q
Listen for...

Call Accountability
You can use your own extension number at any other extension
to place toll calls that should be billed to you.
Billing Calls to Your Extension
1 Listen for dial tone, then press  #    #  .q q
2 Dial your extension number.
3 Listen for dial tone, then dial the telephone number.
NOTE: If you make a mistake, hang up and restart the
sequence.
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