WHY IS MESSAGE LIGHT ON, BUT I DON'T HAVE ANY MESSAGES. HOW CAN I TURN IT OFF? DT300 DTL-12E-1 BK TEL DLE(12)Z-BK?

The steps to delete auto attendant messages, including day/night mode, opening inbox, schedule 1, schedule 1 intervals A/B/C, will depend on the specific phone system or software you are using. However, here are some general steps you can follow: Access the auto attendant menu: This is usually done by dialing a specific extension or accessing the system through a web-based portal. Navigate to the message management section: This section may be labeled "Greetings," "Prompts," or "Recordings," depending on your system. Select the message you want to delete: This may involve listening to the message or selecting it from a list. Choose the delete option: This may involve pressing a button or selecting a menu option. Confirm the deletion: Some systems may require you to confirm the deletion before it is finalized. Repeat for all auto attendant messages you want to delete. It's important to note that deleting auto attendant messages may affect the functionality of your phone system

go to setting or call your service company

5-6 rings I think that is the best you can get
link to a manual for it

SV8100 DT310/DT330/DT710/DT730 User Guide - NEC Corporation ...
https://www.necam.com/Docs/?id=5601ae16-b7e2-4e8c-a769...

NEC-10645 UNIVERGE SV8300 DT300 DT700 USER GUIDE
au.nec.com/.../SV8300_Handset_Manual-ce03fb6c-32af-4991-9bd5-8ec.

PUSH JUST THE BUTTON SPEAKER TWICE
IT MAKES THE HAND FREE CALL YOUR PHONE WAS FORGOTTEN ON FREE HANDS CALL

I am not sure which country you are in, but in Australia your divert depends on your phone carrier not your model. If your carrier and call plan supports call forward you just dial their set number and follow the prompts to turn on or off.

Once the messeges are cleared, the light will stop blinking.
There should be a button to push, which will allow you to access the messeges options.

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how do i connect head set in nec dt 300 series phone ?
and is there any configuration needed for that ?

What model of NEC phone system do you have? Go look in the phone or data room and look at the PBX. You might also be able to press Feature 3 to get some information which would be helpful to a tech. If it is an SV8100 try this:

To set the system Time:

1. Press

Speaker.

2. Dial

728.

3. Dial two digits for the hour (24 hour clock, 13 = 1:00 PM).

4. Dial two digits for the minutes (00~59).
5. Press

Speaker to hang up.