ATT System 25 MultiLine Telephone User Guide

Data Dial Code (DDC)
When your System 25 was installed, Data Dial Codes (DDCs)
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).
Display Unit
If your...

Multiline 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 mandantory, you may still optionally 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 -...

Account Code Entry (Continued)
Account Code Entry - Incoming Calls
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Automatic Intercom
You and another person may each have a button labeled
that you can use to call each other.
Using AUTO ICOM
1  Press
2 Listen for ringback.
11 

Bridged Access
This feature allows for a common connection between a specific
button, on your telephone and a specific line
button, on someone elses telephone.  You can 
join in a call or cover the other line by using your bridged access
button.  Up to 15 people can use their bridged access buttons for 
the same system access button. 
Your System Administrator can set your 
to ring in any of the following ways: button
n Ring immediately when a call rings
line.
n Ring after a predetermined numberat the...

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
sequence.
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Call Waiting
If all of your System Access buttons are busy, you may be
notified (through your handset) that a call is waiting. If you
hear one short tone, it is an inside call waiting; two short tones
indicate you have an outside call waiting.
If you have a System Access-Outgoingbutton on 
your telephone, you can put your calls on hold and answer the
call waiting.If you do not have this button, you must end one
of the existing calls in order to answer the call waiting.
Answering - Using SYS ACC-O
1 Press...

Callback
If a System 25 extension or outside line is busy when you place a
call, you can request a callback. Your call will wait in a line
(called a queue) for the extension or line to become available.
The system will then alert you with a priority ring and complete
the call.
For inside calls, use Callback when you hear a busy tone or a
special ringback tone.For outside calls, use Callback only when
you hear fast busy tone.
NOTE: You may hear the callback request queueing tone
automatically when you...

Conference Calls
You can set up a conference that includes a combination of
System 25 extensions as well as outside calls. You may have up
to five conferees; however, no more than two may be on outside
lines.
Setting Up Conference Calls
1 Dial the first person and announce the conference call.
2  Press 
and listen for dial tone. 
The light next to the held call blinks intermittently.
3 Dial the next person you want added to the conference.
NOTE: If for any reason this call should not be added (busy,
no...

Coverage
If your System Administrator has administered this feature, calls
to you can be answered (covered) at specified telephones when
you do not answer the call yourself. Calls unanswered at your
telephone will start ringing at the covering telephone after a
preset number of rings.
However, if you are busy on another
line, calls will go to coverage after a preset number of rings
(usually one).
Buttons used for Coverage answering are:
 Coverage calls for one specific person are sent
to an Individual...