In article 2,
DerbyBorn writes

I would think that REN does not apply to DECT extensions as the extensions
ringing is not a function of the incoming line - other than the first base
unit. Can someone confirm?

Yes, it's the physical load on the line that matters so the number of
DECT handsets does not matter.

It's worth noting too that if a unit (phone/base-station/ringer) places
any ringing load on the line then the minimum REN recorded against it
must be one (no 0.5 or 0.25). As DECT base stations merely load the line
to detect the ringing rather than power the ringer itself then they may
present a far lower load, permitting you to break the rules by exceeding
an official REN of 4.
--
fred
it's a ba-na-na . . . .