Marks & Spencer IDECT X2I TWIN Manual page 6

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Connection and conditions for use
You can connect your telephone to a direct exchange line (DEL) - a line
connected to a local exchange, with its own phone number; to an
extension socket connected to a DEL; or to an extension on an approved
compatible PBX. Do not connect the telephone as an extension to a
payphone.
The ringer equivalence numbers (RENs) of all instruments (phones,
fax machines, etc.) connected to an exchange line must not add up to
more than 4 - otherwise, one or more of them may not ring and/or
answer calls correctly. The telephone has a REN of 1, and most other
telephones have a REN of 1 unless marked otherwise.
Help Line:
0845 671 0665
(Local Call rate)
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