AT&T E5908 - Manual (Page 32)

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