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PAYPHONE *
Deleting all numbers from
The caller is ringing from a
the calls list
payphone.
RINGBACK *
The telephone number you have
set on Ring Back is now free to
Press the
and
buttons to
1
receive your call.
display any call from the calls list.
NO NUMBER
See 'HELP' section. This message
Clear
will not be stored in the calls list.
2
Press and hold the Clear button for
approximately 6 seconds until the
display shows LIST EMPTIED.
* Some text messages can have
All numbers in the calls list are
numbers associated with them. Your
now deleted.
Caller Display 20 will alternate
between the text message and the
telephone number. They will be
Caller information not
displayed for 5 seconds each.
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.
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.
Help
BT can supply a REN booster to
support up to 8 separate pieces of
equipment connected to your line.
If you have any difficulty using your
Caller Display 20, look in this section
NO NUMBER
first for solutions to the most common
displayed
problems.
Your Caller Display 20 checks the
content of the Caller Display
messages it receives. If it detects a
No dialling tone
problem with a message, it displays
Make sure the telephone line cord is
NO NUMBER rather than risk leaving
plugged into the telephone socket at
a message with a possible mistake.
the back of the unit and that the
This does not mean your telephone
telephone line cord is connected to
is faulty.
your wall socket.
If you continually receive NO
NUMBER messages, call BT free of
Check that no other extension is
in use.
charge or your service provider.
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.
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.
Technical
The Caller Display service does not
function when connected to most
information
switching systems.
Environment
Advice on connection to BT systems can
Your Caller Display 20 should be kept
be obtained by dialling BT Freefone
free of dust, moisture, high temperature
0800 800 152.
and vibration, and it should not be
exposed to direct sunlight. It should not
be used in bathrooms or near water.
Guarantee
If you own your Caller Display 20 and it is
Warning
under BT's guarantee:
Your Caller Display 20 is designed to
be operated in a normal office or
BT guarantees the product for one year,
domestic environment only, where the
provided that:
relative humidity is no more than 60%.
•
The goods have only been used for
their intended purpose, and have not
Maintaining your Caller Display 20
been subjected to misuse or been
Clean with a soft cloth.
wilfully or accidentally damaged.
Do not clean with a wet cloth.
Do not clean with abrasive materials or
•
The goods have not been tampered
solvents, as these may damage the unit.
with or repaired by anyone other than
Do not spray with aerosol cleaner.
BT, its staff or its agents.
Do not place on untreated antique furniture.
If a fault does occur, and you bought the
How many phones can you have?
unit yourself, it will be either repaired or
Although you may have any number of
replaced free of charge provided you
sockets, it is important to limit the
return it to where you purchased it and
number of phones and other items
produce your receipt.
connected in order to ensure that each
phone will ring.
The terms and conditions of this
guarantee do not affect your statutory
All telephone equipment has a Ringer
rights.
Equivalence Number (REN), which is
used to calculate how many pieces of
If you own your Caller Display 20, but the
equipment may be connected to any one
guarantee period has expired:
telephone line. Your Caller Display 20 has
a REN of 0.
If your Caller Display 20 needs repair
after the guarantee period has ended, it
Telephones provided by BT have a REN
must be repaired so as to remain
of 1, unless otherwise stated on the
compliant with the approval requirements
underside of the phone. Even where the
for connection to the telephone network.
number of telephones has been limited
there is no guarantee that different types
For details of BT's recommended repair
of phone on the same line will ring, even
agents, please call BT free of charge on
when the REN is less than 4.
Freefone 0800 800 150, or visit your
You must not connect more than 4 Caller
nearest BT shop.
Display products to a single line.
them
to
subject
specified
to
connection
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
Drill 2 holes suitable for the wall plugs supplied then
2
screw to the wall through the holes in the bracket.
Place your Caller Display 20 centrally over the bracket,
3
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.
CALLER DISPLAY 20
Userfriendly
1
2
Guide
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Offices
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
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