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 Service on your
line. For more information about
the service, please call BT free of
charge or your service 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.
User
friendly
Guide
CALLER DISPLAY 20
Offic
es i
n Eu
rop
e, N
ort
h
Amer
ica
, J
apa
n a
nd As
ia
Paci
fic
.
The Telecommunications ser
vices described
in this publication are subject to availability
and may be modified from time to time.
Services and equipment ar
e provided subject
to British Telecommunications plc’s
respective standar
d conditions of contract.
Nothing in this publication forms any par
t of
any contract.
Touc
hton
e™
is a register
ed trade mark of
British Telecommunications plc in the UK.
© British Telecommunications plc 1998.
Registered Of
fice: 81 Newgate Street,
London EC1A 7AJ.
Registered in England No. 1800000.
Printed in Malaysia
Caller Display 20 Issue No.1 (8/98).
Designed by The Art & Design
Partnership Limited.
CE compliant to 89/336/EEC
(EMC Directive) & 73/23/EEC
(Low Voltage Dir
ective)
APPROVED
for connection to
telecommunication systems specified
in the instructions for use subject to
the conditions set out in them
For use with
BT’s Caller Display
*
*Caller Display service requires set-up by BT or your
service provider and connection to a digital exchange
Deleting
all
numbers from
the calls list
Press the
d
and
f
buttons to
display any call from the calls list.
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 explanatory
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.
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 service provider.
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
Free
fone
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
Free
fone 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.
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.
Drill 2 holes suitable for the wall plugs supplied then
screw to the wall through the holes in the bracket.
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.
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 office 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.
1
2
3
Clear
1
2
35mm
1
2
