AT&T ML17959 - Manual (Page 56)

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Caller ID
Reasons for missing caller ID information
Screen message Reason
Private name
The caller prefers not to show the name.
Private number
The caller prefers not to show the telephone
number.
Private caller
The caller prefers not to show the name and
telephone number.
Unknown name
The telephone service provider cannot determine
the caller’s name.
Unknown number
The telephone service provider cannot determine
the caller’s telephone number.
Unknown caller
The telephone service provider cannot determine
the caller’s name and number.