Uniden DECT2085 Series Owner's Manual page 24

Registering Accessory Handsets
If.you.purchase.an.accessory.handset,.you.need.to.register.the.handset.before.use..Handset(s).supplied.in.the.box.
with.the.base.are.pre-registered.at.the.factory..When.charged,.pre-registered.handsets.display.a.handset.ID.number..
Handsets.that.have.not.been.registered.display:
To.register.a.DCX200.accessory.handset:
) Charge.the.handset.for.5-20.hours.
2) Place.the.handset.in.the.main.telephone.base.cradle.to.initiate.registration..HANDSET.REGISTERING.will.
appear.in.the.LCD..
3) Wait.approximately.thirty.seconds,."REGISTRATION.COMPLETE".will.be.displayed.to.indicate.the.handset.has.
been.registered.to.the.base.and.a.handset.ID.will.be.automatically.assigned.
If.REGISTRATION.FAILED.appears.in.the.LCD,.please.try.these.steps.again.
Note:. If.an.accessory.handset.has.ever.been.registered.to.a.base,.you.must.reset.the.handset.before.you.can.
register.it.to.a.new.base..See.Resetting.the.Handset.on.page.57.
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