BT Essential Phone Single Quick Setup And User Manual page 63

General information
Technical details
How many phones 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 Essential Phone 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 Essential Phone supports timed
break recall but not earth
loop recall.
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If you need some help, call us on 0800 145 6789 or go to bt.com/producthelp