AT&T 360 - Manual (Page 15)

Display Screen Messages
Screen Displays: When:
PRIVATE NAME The other party is blocking name information.
PPP The other party is blocking telephone number
information.
PRIVATE CALLER The other party is blocking name and number
information.
UNKNOWN CALLER Your phone company is unable to receive
information about this caller’s name and number.
UUU Your telephone company is unable to receive
information about this caller’s number.
UNKNOWN NAME Your telephone company is unable to receive
information about this caller’s name.
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CALLER ID OPERATION