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Setting Up

Please read the instructions carefully before use, and keep this
user guide for future reference.

Connect the telephone line cord

Safety information

Do not expose to direct sunlight.

Do not stand your product on carpets or other surfaces which
generate fibres, or place it in locations preventing free flow of air
over its surfaces.

Do not submerge any part of your product in water and do not
use it in damp or humid conditions, such as bathrooms.

Do not expose your product to fire, explosive or other hazardous
conditions.

Cleaning

Simply clean the handset and base station with a damp (not wet)
cloth, or an antistatic wipe. Never use household polish as this
will damage the product. Never use a dry cloth as this may
cause a static shock.

Duet 550 – Edition 2 – 26.7.00

At a glance

5

J KL

8

0

TUV

9

WXY

Z

7

PQR

S

3

DEF

6

MNO

4

HG

I

1

2

ABC

Quickdial

Recall

Secrecy

Redial

Program

Pause

Ringer

M2

M2

M1

M3

M1

M3

Hook switch

Lets you make a 
follow-on call without
replacing the handset.

Speaker volume
control buttons

Used to adjust the
speaker volume 
of a call.

Quickdial button

Use to store and dial
Quickdial numbers.

Secrecy button

Allows you to talk 
to someone in the
same room without
your caller hearing.

Memory label

To keep a note 
of your one-touch
numbers.

Memory buttons

Use to store and
dial one-touch
numbers.

Recall button

For use with
switchboards and
BT Select Services.

Redial button

Press to redial the
last number called
or to enter a pause
in the memory.

To adjust the ringer tone and volume

Your Duet 550 has 3 ringer tones to choose from. The volume of
the tone can also be adjusted or you can turn the ringer off. See
the table opposite to help you select the right setting.

•Press the 

SECRECY

button. The LED will start to flash.

•Press the 

#

button.

•Press the keypad button, 

0

to 

9

, for the tone/volume you want.

You will hear a beep to confirm your setting. The beep is from
the handset and not audible unless held up to the ear.

•Press the 

SECRECY

button. The LED will stop flashing.

Your selected setting is now stored.

To adjust the speaker volume

The speaker volume can only be adjusted when the telephone is
off the base.

The switch can be found on the left hand side of the telephone.

There are 5 levels. 

1

= quietest.

5

= loudest.

The volume will remain at the level you have set between calls
until you adjust it again.

Press to increase the volume.

Press to decrease the volume.

Duet 550 – Edition 2 – 26.7.00

Using your Duet 550
telephone

To make a call

•Lift the handset. You will hear a dial tone.
•Enter the telephone number. The number will be dialled.

To end a call

•Replace the handset. 

To redial the last number

•The last number dialled is stored in the redial memory.
•Press the 

REDIAL

button. The number is dialled automatically.

To switch secrecy on and off

When on a call you can talk to someone in the same room,
without your caller hearing.

•During a call press the 

SECRECY

button. 

The LED will flash to indicate that secrecy is on. You can talk
and your caller will not hear you.

•To resume your call press the 

SECRECY

button again.

The LED will stop flashing.

If you are redialling a number when connected to a switchboard,
wait until you hear a dial tone, then press the 

9

button, wait again

for a dial tone and then press 

REDIAL

. This applies even if 

9

is

stored in 

REDIAL

.

up

down

Redial

Secrecy

Secrecy

Secrecy

0-9

Duet 550 – Edition 2 – 26.7.00

Volume

Quiet

Medium

Loud

Tone 1

1

2

3

Tone 2

4

5

6

Tone 3

7

8

9

No Tone

0 = Silent

When the ringer is switched off the ring indicator light will continue
to flash to indicate an incoming call. The ringer will remain
switched off until you lift the handset again. It is not possible to
switch the ringer off permanently.

To use the Recall button

You may need to use the 

RECALL

button if you are connected 

to a switchboard/PBX (Private Branch Exchange), contact your
PBX supplier for further information. The 

RECALL

button is

also used for BT Select Services.

To store a number using the MEMORY buttons 
(M1, M2, M3)

•Press the 

SECRECY

(Program) button. The LED will start 

to flash.

•Press the 

MEMORY

button (

M1

M2

, or 

M3

) under which you

want to store the number.

•Use the keypad to enter the telephone number.

•Press the 

SECRECY

button. The LED will stop flashing. 

The number is now stored.

Storing and dialling numbers

You can store up to 10 numbers in the 

QUICKDIAL

memory 

(

0

to 

9

) and a further 3 numbers using the 

MEMORY

buttons

(

M1

M2

and 

M3

).

Your Duet 550 comes with memory labels which can be used

to keep a note of your stored numbers.

To store a pause in the dialling sequence of a memory number,
e.g, 

9

, pause, 

6

, press the 

REDIAL

button. Please note that if a

pause is entered in a memory location in any of the 1st 5 digits it
will cause a 2 second pause. If a pause is stored after the 5th digit

dialling will stop until the 

REDIAL

(pause) button is pressed.

Recall

M3

M2

M1

M3

M2

M1

Secrecy

Secrecy

Duet 550 user guide 6pp  10/8/00  3:23 pm  Page 1

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