AT&T E5908 User Manual page 34

Caller ID Operation
There are also occasions when other information or no
information is displayed for various reasons:
On-Screen Message
PRIVATE NAME
PRIVATE CALLER
UNKNOWN NAME
UNKNOWN CALLER
Contrast Adjustment (telephone base only)
There are four levels of contrast on the screen of the
telephone base which can be adjusted to suit different
viewing angles for both desktop use or wall-mounting.
Press on the telephone base to adjust the
CONTRAST
contrast on the screen.
30
Reason
Caller prefers to remain anonymous.
Caller's name and telephone number are
not revealed at caller's request.
Your local telephone company is unable to
determine the caller's name.
Your local telephone company is unable to
determine the caller's name and telephone
number. Long-distance calls from over-
seas also generate this message.