I have a NEC Dterm Series II phone. I need to

Which NEC system is the Dterm Series i connected to? Normally you change the ext name in system programming, but I need to know which system it is.

Feature, Redial, press button to program, dial 1, dial the extension number, Feature to write and exit. ONLY IF the buttons are programmed as feature buttons, they may be just dead buttons, useless until they are assigned in system programming as feature buttons.

Press Feature, press the button you wish to program, dial the number and press Feature.

Why are you pressing the feature button?

Press feature then answer. You envoked ringing line pick up.
Press feature then speed dial button, dial a number like your dialing out, then feature again. You've just set a speed dial button.
Press feature, then 3 and you've changed your ringtone on a series i phone.

feature, redial, button allocation # sys=0-79
sta=80-99
dial 1 for number
than 9 plus full phone number
feature to save

speaker 42 from operator phone
dial x to be forwarded than x to forward to
hang up

The manual is here.

NEC doesn't call it the "Dterm 80 manual," but that's it. It's titled "Electra Elite IPK II Multiline Telephone User Guide."

This works on the series E phones. It may or may not work on the series II.

1. Press the Speaker key (do not use the handset).
2. Dial the Name Assignment access code and wait for the special dial tone.
3. Using the key pad spell the name. Press each number until the letter appears.
4. When the correct letter is displayed Press the HOLD key. Pressing the HOLD key will lock the letter in place and advance to the next position.
5. Repeat steps 3 and 4 continue to spell the name.

Pressing the TRANSFER key will change the current letter to lower case.
Example to enter the name “Pat” press:
77 HOLD 22 TRANSFER HOLD 88 TRANSFER HOLD

Main support number 1-800-338-9549, I'm sure they can help you

While the station is ringing - Press "1"

The feature must be enable in programming to be active.