How do I change the ringtone on a NEC Dterm80 phone

SOURCE: NEC Dterm80 ring tone

To here ring types hit speaker then 711, then 1 for internal rings (select 2 for outside ring selection) then 1-8 the ring type.
To set ring type hit speaker then 720 (follow all the steps above).

SOURCE: Change time on nec dterm80 phone

Press the "Speaker" button and enter 728 on the key pad. Then enter the correct time in 24 hour format. For example at 2.56 p.m. type 1456. Then press speaker again and you're done

SOURCE: NEC Dterm80- I need to change the date

On the adminstrator's phone (usually ext 100, 101, 110 or 10)

Do not lift handset
Press the FEATURE button
Dial 9#
Enter the hour & minutes (ex:01:25) using the dialpad
Press RECALL button to change AM/PM setting
Press HOLD to change the calendar setting
Press FEATURE button again to save & exit
Hope it works for you

SOURCE: Headset for NEC Dterm80

Do a search for a plantronics headset. All of theirs work well with NEC

SOURCE: Trying to change the name on the display on the phone

Dial 700>dial your ext #>enter name>press Hold & press Speaker