Line Power Mode (No Ac Power) - AT&T CL4939 User Manual

Telephone operation

Line power mode (no AC power)

This telephone provides minimal functionality
during a power failure. When AC power is not
available, the screen is blank and many telephone
features do not function. Only touch-tone dialing
and volume adjustment (ringer volume and
handset volume) are supported. The telephone
uses power from the telephone line to enable you
to make and answer calls using only the handset
and dial pad keys.
To make a call during a power failure
1. Lift the handset and wait for the dial tone. The
screen shows NO AC POWER.
2. Slowly dial a telephone number using the dial
pad keys. Wait to hear each key tone and make
sure the digit appears on the screen before
pressing the next dial pad key.
NOTE: If the telephone is not powered by the
supplied power adapter, there is a delay when
dialing digits.
To answer a call during a power failure
• Lift the handset.
NOTE: The screen does not show incoming
caller ID information during a power failure.
To adjust the handset volume during a power
failure
VOL switch on the right side of the
Use the
telephone base to adjust the listening volume
from the handset.
To adjust the ringer volume during a power
failure
Adjust the RINGER VOL switch on the right side of
the telephone base to set the ringer volume to off,
low, middle or high.
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