AT&T CL4939 user manual If you select NEW Call First in Call List Order, Feature summary on

Appendix

Troubleshooting

My caller ID features •	Caller ID is a subscription service. You must
are not working	subscribe to this service from your telephone service
properly	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 15) 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 new (unreviewed)
	caller ID entries 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 15).
•	Make sure the area codes are set correctly in the
	telephone (see Set home area code on page 19
	and Set local area code on page 19).
•	Reset the telephone. See Common cure for
	electronic equipment on page 58.
•	If you subscribe to high-speed Internet service
	(digital subscriber line - DSL) 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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