3D Connexion 555-540-702 User Manual



Issue 1


AT&T System 25

Single-Line Telephone

User Guide

©1989 AT&T

All Rights Reserved

Printed in USA


Contact: Your AT&T sales representative, or

Call: 800-432-6600, Monday to Friday between 7:30 am and 6:00 pm EST.

In Canada call: 800-255-1242, or

Write: 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 information is subject to change. This document will be reissued periodically to incorporate changes.

Single-Line Telephone User Guide

Prepared by the

Technical Publications Group





Single-Line Features

Account Code Entry


Call Accountability


Call Waiting




Conference Calls


Direct Group Calling (DGC)






H o l d


Leave Word Calling


Message Waiting


Night Service




P a r k




Placing Calls


Programming Speed Dialing Codes


Speed Dialing





3D Connexion 555-540-702 User Manual


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. However, if you have a rotary set, you will not be able to use the features that require you to enter a “*” or #” character.


Your AT&T System 25 has two types of features: fixed and assignable. A fixed feature is one that is provided on every single-line telephone. (In this guide, fixed features are indicated at the beginning of a feature description by a box with a check.)

An assignable feature is not provided automatically. It must be “assigned” by your System Administrator. (In this guide, assigned features are indicated at the beginning of a feature description by an empty box.)

fixed feature

assignable feature

Check with your System Administrator as to which features have been assigned to you. (As a reminder, you can place a check in the box of each assignable feature as you receive it.)


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 place another call right away, be sure to hold down the switchhook for more than two seconds.

NOTE: If you have a RECALL or FLASH button on your telephone, you can press it instead of the switchhook.

The RECALL or FLASH buttons cannot be used to disconnect a call.

Ringing Tones

System 25 signals you with three distinctive rings. The rings and their descriptions are listed below.


Your call is from a person inside your company.

OUTSIDE CALL IIIII IIIII (two short rings)

Your call is from the attendant or someone outside your company.

PRIORITY RING IIIII IIIII IIIIIIIIII (two short rings and one long ring) You are being alerted that your request for Callback can now be completed; or a call is being set up remotely for your phone via a data feature known as Third-Party Call Setup.


IIIIIIIIIIIIIIIII II (one long tone 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 one short, dull tone)

The person you dialed is busy, and has been notified of Call Waiting.

BUSY TONE IIIII IIIII IIIII (repeating on/off tone)

The number you dialed is busy.

FAST BUSY TONE Ill Ill Ill Ill (fast repeating on/off tone) The number you dialed was busy, misdialed, or restricted.

CALL WAITING TONE (short tone(s) heard during a call)

III(the waiting call is an inside call)

III III (the waiting call is an outside call)

You have a call waiting to be answered.

QUEUEING TONE II II II II II (five short tones)

Your request for a callback has been confirmed.

DEQUEUEING TONE II II II (three short tones)

The extension or outside line that you requested for callback is now available.


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 Information

See your System Administrator if you have any questions or would like additional information about your System 25 features.


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 Listen for dial tone, then press * 0 .

2 Dial the account code.

NOTE: If you make a mistake while entering the account

code, press * 0 again, then the correct account code.“

3 Listen for dial tone.

4Dial the outside line access code and listen for dial tone again.

5Dial the telephone number.



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


1After you have completed your conversation, and before you hang up, press the switchhook.

2Listen for confirmation tone and dial tone.

3Dial * 0 .

4 Dial the account code.

NOTE: If you make a mistake while entering the account code, dial * 0 again and then the account code.

5 Listen for confirmation tone, then hang up.


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 # # .

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



Call Waiting

While you are using your phone, you may be notified through the handset that a call is waiting. If you hear one short tone, it is an inside call waiting for you; two short tones indicate that you have an outside call waiting.

You must either end the existing call or place it on hold in order to answer the call waiting.

Answering - Holding the Existing Call

1 Press the switchhook.

2Listen for confirmation tone and dial tone.

3Press * 9 .

4Answer the waiting call.

5After completing the second call, press the switchhook twice in order to return to the held call.

NOTE: If you hear dial tone, press the switchhook once more

to return to the call on hold.

Answering - Ending the Existing Call

1 Hang up.

2 When the telephone rings, lift the handset.


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