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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 service.

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)

At a glance

IMPORTANT

Check that your 

Caller Display 20

is complete. When

you unpack it you

should have:

Caller

Display
20 with

telephone

line cord
attached

Screws

and wall
plugs for

wall

mounting

Wall-

mounting

bracket

New call indicator

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

Dial button

Press to dial a number
shown on the display.

Display

Displays number information in
the calls list. Also shows battery
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.

Clear button

Deletes numbers
stored in the calls list.

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 

Free

fone 0800

800

150

and ask for a BT engineer to

come and fit the correct type. This is
a chargeable service. 

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
service.

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

Press the 

f

button. This brings up

details of the most recent incoming
call.

Press the 

f

button again to display

the next most recent call.  
Continue pressing until the display
shows 

END OF LIST

.

Press the 

d

button at any time to

move up the list.

Adjusting the contrast

on the display

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

Press 

and hold

the 

f

button.

Press the 

d

button. The display

shows 

LCD CONTRAST

.

Press the 

d

button until the contrast

you want is available. 

Dial

1

2

1

1

2

3

1

2

3

1

2

3

4

Insert batteries

Open the battery 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.

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

You will need 4 x AAA alkaline batteries.

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 Service, details of which are
obtainable from BT on:

Free

fone 0800

800 150

for

residential customers. 

Free

fone 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 service. Call
your service provider for more
information.

Your Caller Display 20 is now
ready for use

Release the 

f

button. The contrast

on the display is now set.

Dialling numbers stored 

in the calls list 

Press the 

d

and 

f

buttons to find

the number you wish to dial from
the calls list.

Press the 

Dial

button. The number

on the display is dialled automatically.
When the number is dialled the
display will show 

LIFT HANDSET

.

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

Press the 

d

and 

f

buttons until you

have found the number you wish to
delete.

Press the 

Clear

button twice in

quick succession (within one and a
half seconds).
The number is now deleted.

Clear

Clear

2

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