BT CALLER DISPLAY 20 User Manual

New call indicator

Clear

Clear

Flashes when calls have been
received since you last viewed
the calls list.

Dial button

Press to dial a number
shown on the display.

IMPORTANT

Check that your

Caller Display 20

is complete. When

you unpack it you

should have:

At a glance

Display

Displays number information in
the calls list. Also shows batter y
low warning for up to two weeks
before the batteries run out.

Scrolling buttons

Use to move up and
down through the
calls list. Also used to
adjust the contrast of
the display.

Caller
Display
20 with

telephone

line cord
attached

✓

You will need 4 x AAA alkaline batteries.

Clear button

Deletes numbers
stored in the calls list.

Screws
and wall
plugs for

wall

mounting

✓

Wall-

mounting

bracket

✓

Introduction

Your Caller Display 20 is designed
for ease of use and is made to the
high standards set by BT.

Thank you for choosing BT’s Caller
Display 20. You can expect many
years of quality ser vice.

Please read the instructions
carefully before use and keep this
User Guide for future reference.

Hints and tips boxes

In this user guide we’ve included
helpful tips and useful notes.
They are shown in a white box
like this.

For your records

Date of purchase:

Place of purchase:

Serial number:

(see base of unit)

Purchase price:

(for warranty purposes, proof of
purchase is required, so please keep
your receipt)

Installing your

Caller Display

20

Situating your

Caller Display 20

Position your Caller Display 20 close
enough to a phone socket for the
cables to reach.

Do not stand it on carpets or other
similar surfaces which might
generate fibres.

Do not cover or enclose the
machine. Allow a free flow of air to
its surfaces.

Your Caller Display 20 can be
wall-mounted. For instructions
on how to do this, see ‘Wall-
mounting’.

Check your telephone

wall socket

If you do not have a modern-style
socket, call Freefone 0800 800
150 and ask for a BT engineer to
come and fit the correct type. This is
a chargeable ser vice.

Insert batteries

1

Open the batter y compartment at
the back of your Caller Display 20 by
pushing it upwards from the bottom
edge.

✱

You will need 4 x AAA alkaline
batteries.

2

Insert the batteries as shown in the
diagram then replace the lid.

It is important to maintain the
batteries in your Caller Display 20.
Without battery power the screen
showing callers’ details and other
display features will not work.

Battery low indication

When the batteries are nearing
the end of their useful life the
display will show a ‘battery low’
symbol. The same symbol will be
shown when the batteries are
completely flat.

Plug your Caller Display 20

into the wall socket

Connecting a telephone to

your Caller Display 20

To connect a telephone to your
Caller Display 20, plug the
telephone line cord into the socket
on the back of the unit.

Alternatively, connect both the Caller
Display 20 and your telephone to the
wall socket via a doubler socket.

BT’s Caller Display

Service

Your Caller Display 20 receives and
displays caller information, which is
transmitted over the BT network. The
information will include the date and
time the call is received, and in most
cases the caller’s phone number.

To enable your Caller Display 20 to
show this information, you will first
have to subscribe to BT’s Caller
Display Ser vice, details of which are
obtainable from BT on:

Freefone 0800 800 150 for
residential customers.

Freefone 0800 800 152 for
business customers.

Information displayed via

other UK networks

To enable your Caller Display 20 to
display information transmitted via
another UK network, you will first
have to subscribe to that network’s
own Caller Display ser vice. Call
your ser vice provider for more
information.

Your Caller Display 20 is now
ready for use

Using your

Caller Display

20

Using the calls list

When your Caller Display 20
receives a call, it automatically
stores the caller’s phone number
and other information in the ‘calls
list’, including the date and time of
the call.

It can store up to a maximum of 30
calls. To make room for new
incoming calls it discards old stored
numbers, starting with the oldest.

Your Caller Display 20 will store the
callers details whether the call has
been answered or not.

Setting the date

and time

The date and time will be set
automatically the first time you
receive a call, provided you have
subscribed to a Caller Display
ser vice.

New calls indicator

The red ‘new calls’ indicator flashes
to tell you that new calls have been

received since you last checked the
calls list.

The number of new calls received
will also be displayed in the top right
hand corner of the screen.

Reading the calls list

1

Press the
details of the most recent incoming
call.

2

Press the fbutton again to display
the next most recent call.
Continue pressing until the display
shows END OF LIST.

3

Press the dbutton at any time to
move up the list.

You can adjust the contrast on the
display to make the screen lighter or
darker.

1

Press and hold the fbutton.

2

Press the dbutton. The display
shows LCD CONTRAST.

3

Press the dbutton until the contrast
you want is available.

f

button. This brings up

Adjusting the contrast

on the display

4

Release the fbutton. The contrast
on the display is now set.

Dialling numbers stored

in the calls list

1

Press the dand fbuttons to find
the number you wish to dial from
the calls list.

Dial

2

Press the Dial button. The number
on the display is dialled automatically.
When the number is dialled the
display will show LIFT HANDSET.

3

Lift the handset of the telephone
connected to your Caller Display 20
within 10 seconds.

When the connected telephone is in
use the ‘extension in use’ icon
appears.

If you have dialled the wrong
number, or wish to stop dialling
out, press the Clear button.

Deleting a single number

from the calls list

1

Press the dand fbuttons until you
have found the number you wish to
delete.

2

Press the Clear button twice in
quick succession (within one and a
half seconds).
The number is now deleted.

Deleting all numbers from

the calls list

1

Press the dand fbuttons to
display any call from the calls list.

Clear

2

Press and hold the Clear button for
approximately 6 seconds until the
display shows LIST EMPTIED.
All numbers in the calls list are
now deleted.

Caller information not

available

With some incoming calls the
telephone number of the caller is not
available and cannot therefore be
displayed on your Caller Display 20.

In this case, Caller Display 20
provides you with some explanator y
information about the type of call
you have received. This comes in
the form of a text message and will
be one of the following:

INT’L (International)
Call received from outside the UK.

UNAVAILABLE

The caller’s exchange/network/
switchboard does not operate a
Caller Display service.

WITHHELD

The caller has not permitted his or
her number to be sent.

OPERATOR *

The call has been made via the
operator.

PAYPHONE *

The caller is ringing from a
payphone.

RINGBACK *

The telephone number you have
set on Ring Back is now free to
receive your call.

NO NUMBER

See ‘HELP’ section. This message
will not be stored in the calls list.

* Some text messages can have
numbers associated with them. Your
Caller Display 20 will alternate
between the text message and the
telephone number. They will be
displayed for 5 seconds each.

Help

If you have any difficulty using your
Caller Display 20, look in this section
first for solutions to the most common
problems.

No dialling tone

Make sure the telephone line cord is
plugged into the telephone socket at
the back of the unit and that the
telephone line cord is connected to
your wall socket.

Check that no other extension is
in use.

Display screen not functioning
properly or goes blank

Check whether the batteries are
fitted correctly.

Adjust the contrast on your display
(see ‘Adjusting the contrast on the
display’).

Caller Display messages not
being received

To be able to receive and display
messages, you must subscribe to
the Caller Display Ser vice on your
line. For more information about
the ser vice, please call BT free of
charge or your ser vice provider.

Phone does not ring

Check that the ringer is not
switched off on the phone that is
connected to your Caller Display 20.

Check that no other connected
phones are off the hook.

Check whether you have too many
phone extensions in your home or
office. For help with this, please
refer to the section ‘How many
phones can you have?’ in Technical
Information.

BT can supply a REN booster to
support up to 8 separate pieces of
equipment connected to your line.

NO NUMBER displayed

Your Caller Display 20 checks the
content of the Caller Display
messages it receives. If it detects a
problem with a message, it displays
NO NUMBER rather than risk leaving
a message with a possible mistake.
This does not mean your telephone
is faulty.

If you continually receive NO
NUMBER messages, call BT free of
charge or your ser vice provider.

Technical

information

Environment

Your Caller Display 20 should be kept
free of dust, moisture, high temperature
and vibration, and it should not be
exposed to direct sunlight. It should not
be used in bathrooms or near water.

Warning

Your Caller Display 20 is designed to
be operated in a normal of fice or
domestic environment only, where the
relative humidity is no more than 60%.

Maintaining your Caller Display 20

Clean with a soft cloth.
Do not clean with a wet cloth.
Do not clean with abrasive materials or
solvents, as these may damage the unit.
Do not spray with aerosol cleaner.
Do not place on untreated antique furniture.

How many phones can you have?

Although you may have any number of
sockets, it is important to limit the
number of phones and other items
connected in order to ensure that each
phone will ring.

All telephone equipment has a Ringer
Equivalence Number (REN), which is
used to calculate how many pieces of
equipment may be connected to any one
telephone line. Your Caller Display 20 has
a REN of 0.

Telephones provided by BT have a REN
of 1, unless otherwise stated on the
underside of the phone. Even where the
number of telephones has been limited
there is no guarantee that different types
of phone on the same line will ring, even
when the REN is less than 4.
You must not connect more than 4 Caller
Display products to a single line.

Network connection information

Your Caller Display 20 is designed to
work with both BT and other UK
networks, including cable. The equipment
operates in the same way on all networks,
but on some UK networks the caller’s
information will not be displayed until
after the first ring.

The Caller Display service does not
function when connected to most
switching systems.

Advice on connection to BT systems can
be obtained by dialling BT Freefone

0800 800 152.

Guarantee

If you own your Caller Display 20 and it is
under BT’s guarantee:

BT guarantees the product for one year,
provided that:

• The goods have only been used for

their intended purpose, and have not
been subjected to misuse or been
wilfully or accidentally damaged.

• The goods have not been tampered

with or repaired by anyone other than
BT, its staff or its agents.

If a fault does occur, and you bought the
unit yourself, it will be either repaired or
replaced free of charge provided you
return it to where you purchased it and
produce your receipt.

The terms and conditions of this
guarantee do not affect your statutory
rights.

If you own your Caller Display 20, but the
guarantee period has expired:

If your Caller Display 20 needs repair
after the guarantee period has ended, it
must be repaired so as to remain
compliant with the approval requirements
for connection to the telephone network.

For details of BT’s recommended repair
agents, please call BT free of charge on
Freefone 0800 800 150, or visit your
nearest BT shop.

Wall-mounting

Your Caller Display 20 can be wall-mounted using the
screws and wall plugs provided. Use the wall-mounting
bracket provided.

Before you wall-mount your Caller Display 20, check that:

• the wall can support the weight of the apparatus

• the position you choose leaves sufficient space for the
unit to be clear of any obstruction on the wall, such as a
shelf or cupboard.

1

Hold wall bracket against wall ensuring it is level. Then,
with a pencil, mark through holes in bracket for drilling.
Alternatively make 2 marks 35mm apart.

35mm

2

Drill 2 holes suitable for the wall plugs supplied then
screw to the wall through the holes in the bracket.

3

Place your Caller Display 20 centrally over the bracket,
ensuring the 2 lugs on the bracket engage into the slots on
base of unit as shown. Then slide the unit towards the wall
until it clicks into position.

1

2

the conditions set out in them

in the instructions for use subject to

telecommunication systems specified

APPROVED for connection to

(Low Voltage Directive)
(EMC Directive) & 73/23/EEC
CE compliant to 89/336/EEC

CALLER DISPLAY 20

Userfriendly

For use with

Guide

*Caller Display service requires set-up by BT or your

service provider and connection to a digital exchange

BT’s Caller Display

Partnership Limited.
Designed by The Art & Design
Caller Display 20 Issue No.1 (8/98).
Printed in Malaysia
Registered in England No. 1800000.
London EC1A 7AJ.
Registered Office: 81 Newgate Street,
© British Telecommunications plc 1998.

British Telecommunications plc in the UK.

Touchtone™is a registered trade mark of

any contract.
Nothing in this publication forms any part of
respective standard conditions of contract.
to British Telecommunications plc’s
Services and equipment are provided subject
and may be modified from time to time.
in this publication are subject to availability
The Telecommunications services described

Pacific.
America, Japan and Asia
Offices in Europe, Nor th

*