Reasons For Missing Caller Id Information - AT&T SB67108 User Manual

Caller ID

Reasons for missing caller ID information

There are also occasions when other information or no information
shows for various reasons:
On-screen message
PRIVATE CALLER
UNKNOWN CALLER
The caller prefers not to show the
telephone number and name.
Your telephone service provider
cannot determine the caller's name
and telephone number. Calls from
other countries may also generate this
message.
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Reason