Doro CONGRESS 200 Manuel D'utilisation page 14

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REN (RN for New Zealand)
The REN (Ringer Equivalence Number) or (RN) is of significance only if you
wish to connect more than 1 telephone to your telephone line. A standard
telephone line has a maximum REN capacity of 3 (RN of 5). It is possible
to connect 3 devices with a REN of 1 (RN of 1) with no degradation to the
product's performance. Exceeding this limit may cause the volume of the ringer
in any phone to decrease or not ring at all.
Notes for operation in New Zealand
The grant of a Telepermit for any item of terminal equipment indicates only
that Telecom has accepted that the item complies with the minimum conditions
for connection to its network. It indicates no endorsement of the product by
Telecom, nor does it provide any sort of warranty. Above all, it provides no
assurance that any item will work correctly in all respects with another item of
Telepermitted equipment of a different make or model, nor does it imply that
any product is compatible with all of Telecom's network services.
This equipment shall not be set to make automatic calls to the Telecom "111"
Emergency Service. This equipment may not provide for the effective hand-over
of a call to another device connected to the same line.
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