AT&T CL4939 User Manual page 60

Appendix
Troubleshooting
My calls fade out
or cut in and out
when I am using the
telephone.
I hear other calls
when using the
telephone.
Display screen is
blank.
Operation during a
power failure.
• If you are using the handset when this problem occurs,
try unplugging the coiled handset cord and firmly
plugging it in the handset and telephone base again.
• If you are using the speakerphone when this
problem occurs, eliminate any background noise.
Noise from the television, radio, or other appliances
might cause the speakerphone to cut in and out.
Try pressing MUTE when you are not speaking to
eliminate the background noise.
• Disconnect the telephone base from the telephone
wall jack and plug in another corded telephone. If
calls are still not clear, the problem is probably in
the wiring or local service. Contact your telephone
service provider (charges may apply).
• 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.
• Disconnect the telephone base from the telephone
wall jack. Plug in a different telephone. If you still
hear other calls, the problem is probably in the
wiring or local service. Contact your telephone
service provider (charges may apply).
• Make sure the power adapter is securely plugged in the
POWER jack on the back of the telephone base and
into an electrical outlet not controlled by a wall switch.
• This telephone operates during a power failure if a
telephone line cord is installed between the wall
jack and the telephone base. You are able to answer
calls with the handset, and dial calls using the dial
pad keys. No other features work unless AC power is
recovered. All settings in menu options (except SET
TIME/DATE) and all messages stored in the mailbox
are retained during a power failure.
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