NEC NEAX 2400 IPX - Manual (Page 19)

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Answer
When the LED is flashing, press the key to answer a
call waiting.
Transfer
Allows the user to transfer a call.
Hold
Press this key to place an internal or external call on
hold.
Power Save Mode
After a predetermined time, this feature dims the LCD
and Line Keys.
(Not applicable to Dterm IP.)
NOTES: