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General information 67
Technical information
How many telephones can I have?
All items of telephone equipment have a Ringer
Equivalence Number (REN), which is used to calculate
the number of items which may be connected to any
one telephone line. Your BT3920 has a REN of 1. A total
REN of 4 is allowed. If the total REN of 4 is exceeded,
the telephones may not ring. With different telephone
types there is no guarantee of ringing, even when the
REN is less than 4.
Any additional handsets and chargers that you register
have a REN of 0.
Connecting to a switchboard
Switchboard compatibility
This telephone may be connected to most types of
switchboard, however in the event of any difficulties,
consult your switchboard Service Provider.
Recall (R)
Recall is used when connected to certain switchboards/
PBXs and some BT Calling Features, or those services
available via your network provider. The BT3920
supports time break recall but not earth loop recall.
R&TTE
This product is intended for use within the UK for
connection to the public telephone network and
compatible switchboards.
This equipment complies with the essential
requirements for the Radio Equipment and
Telecommunications Terminal Equipment Directive
(1999/5/EC).
Declaration of Conformance
Hereby, BT declares that this BT3920 is in compliance
with the essential requirements and other relevant
provisions of Directive 1999/5/EC.
If you would like a copy of the Declaration of
Conformance, please visit bt.com/producthelp
For your records
Date of purchase:
Place of purchase:
For guarantee purposes, proof of purchase is required,
so please keep your receipt.
Enter your base system PIN here:
[ / / / ]
Enter your remote access security PIN here:
[ / / / ]
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