AT&T CL4939 - Manual (Page 62)

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Appendix
Troubleshooting
My caller ID features
are not working
properly Caller ID is a subscription service. You must
subscribe to this service from your telephone service
provider for this feature to work on your telephone.
The caller might not be calling from an area that
supports caller ID.
Both your and the caller’s telephone service
providers must use equipment compatible with
caller ID service.
Make sure you select
ALL CALLS in CALL LOG (see
Feature summary on page 16) to set the telephone
to record caller ID information in the call history.
If you select
NEW CALL FIRST in CALL LIST ORDER,
the telephone first shows the caller ID entries that
have not been reviewed, then entries starting with
the most recent call in the call history. If you select
BY TIME, the telephone shows the caller ID entries
starting with the most recent call in the call history
(see
Feature summary on page 16).
Make sure the area codes are set correctly in the
telephone (see
Set home area code and Set local
area code on page 19).
Reset the telephone (see
Common cure for
electronic equipment on page 59).
If you subscribe to high-speed Internet service
(DSL - digital subscriber line) through your
telephone line, you must install a DSL filter between
the telephone line cord and the telephone wall jack
(see
Telephone installation on page 7). The filter
prevents noise and caller ID problems caused by
DSL interference. Please contact your DSL service
provider for more information about DSL filters.
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