AT&T 944 - Manual (Page 36)

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IN CASE OF DIFFICULTY
Tone Signals Do Not Activate a Remote Device
• Tone signaling does not work during conference calls.
Operation During a Power Failure
This phone will operate during a power failure if a working battery has
been installed. You will be able to answer calls with the handset or
headset, and dial calls using the keypad and the Speed Dial or Redial
features. No other features will work until power is restored.
Display Screen is Blank
Make sure the power cord is connected to both the phone and an
electrical outlet not controlled by a wall switch.