AT&T TL86109 - Manual (Page 122)

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Caller ID
Caller ID operation
Reasons for missing caller ID information
There are occasions when other information or no information shows for
various reasons:
On-screen message Reason
L
It is a long distance call.
Private name
The caller prefers not to show the name.
Private number
The caller prefers not to show the phone number.
Private caller
The caller prefers not to show the phone number
and name.
Unknown name
Your telephone service provider cannot determine
the caller’s name.
Unknown number
Your telephone service provider cannot determine
the caller’s number.
Unknown caller
No information is available about this caller.