KX-TG6521UAB, KX-TG6521UAT, KX-TG6522UAB, KX-TGA651RUB, KX-TGA651RUT - Panasonic Telephone Service Manual (repair manual). Page 22

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• BS=Base Unit, HS=Handset
• If the max number of handsets are already registered to the base unit, a new handset cannot be registered.
• To register the handset, refer to Registering a Handset to a Base Unit in the Operating Instructions.
• To cancel the handset, refer to Deregistering a Handset in the Operating Instructions.
• To copy the handset phonebook, refer to Copying Phonebook Entries in the Operating Instructions.