RCA 21015 manual Registration, Handset Sound Signals

NO CALLS	Indicates no calls have been received.
MESSAGE WAITING	Indicates a message is available.
LOW BATTERY	Indicates the handset battery is low and needs to be
	charged or replaced.
UNABLE TO DIAL	Indicates the CID record or memory contents
	cannot be dialed.
UNABLE TO STORE	Indicates the CID record or information cannot
	be stored.
PRESS TALK KEY	Indicates the CID Directory Dial Number (DDN)
	cannot be formatted.
DE-REGISTER	Indicates the handset is de-registering from
	the system.
NEW CALL XX	Represents the number of new CID records
	not reviewed.
LONG DISTANCE	Indicates CID record is from a long distance call.
SEARCHING	Handset is searching the base.
NO DATA	No CID information is received.
OUT OF RANGE	Handset is too far away from the base. Move closer to
	the base.
HANDSET NEEDS	Indicates handset is not registered and needs to be
REGISTRATION	registered to function properly.

HANDSET SOUND SIGNALS

Signal	Meaning
A long warbling tone (with ringer on)	Signals an incoming call
Three short beeps	Page signal
One short beep (every 7 seconds)	Low battery warning

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