AT&T Trimline 265 - Manual (Page 33)

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CALLER ID OPERATION
Display Screen Messages
Screen Displays: When:
PRIVATE The caller is blocking the name information.
PPP The caller is blocking the number information.
PRIVATE CALLER The caller is blocking the name and number information.
UNKNOWN Your telephone company is unable to receive information
about this caller’s name.
UUU Your telephone company is unable to receive information
about this caller’s number.
UNKNOWN CALLER Your telephone company is unable to receive information
about this caller’s name and number.
LONG DISTANCE This is a long distance call and there is no information
about this caller's name.