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Technical advice
Environment
Your BT Additional Handset and Charger
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.
Your Additional Handset and Charger is
designed to be operated in a normal office or
domestic environment only, where the relative
humidity is no more than 60%.
Maintaining your Additional Handset
and Charger
Clean with a soft, dry cloth, do not use a damp
cloth. Do not use abrasive materials, solvents
or aerosol cleaners as these may damage the
unit. 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 pieces of apparatus 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 apparatus may
be connected to any one telephone line.
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 products
to a single line.
Network connection information
Your Additional Handset and Charger is
designed to work with both BT and other UK
networks, including cable.
Although this equipment can use either Loop
Disconnect (Pulse) or DTMF (Tone) signalling,
the performance of the DTMF (Tone) signalling
is subject to regulatory requirements for
correct operation. It is therefore strongly
recommended that your equipment is set to
use DTMF (Tone) signalling for access to
public or private emergency services.
DTMF signalling also provides faster call
set-up.
Advice on connection to BT systems can
be obtained by dialling BT Freefone 0800
800 152.