RCA ViSYS 25110 Guide De L'utilisateur page 40

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Ringer Equivalence Number
REN Number
On the bottom of this equipment is a label indicating, among other information, the
Ringer Equivalence Number (REN) for the equipment.
The REN is useful in determining the number of devices you may connect to your
telephone line and still have all of these devices ring when your telephone number
is called. In most (but not all) areas, the sum of the RENs of all devices connected
to one line should not exceed 5. To be certain of the number of devices you may
connect to your line as determined by the REN, you should contact your local
telephone company.
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