How do i change the extention number or port number when i move my Nec Electra Elite 192 phones to different wall phone jacks?

SOURCE: flashing light

It sounds as if that particular extension is in Do Not Disturb.
From that phone, try Feature - 69 - Feature.

SOURCE: Need more rings

You have to change the rings from the voice mail server. If you don't know your way around the server, its best to get a local NEC tech although it is fairly simple to navigate. Depends on your skill. Typical default password for the server is NEC

SOURCE: NEC Electra Elite

you need to access program mode. Did you contact your nec vendor? ldtsnj.com

SOURCE: NEC Electra Elite 192 Phone System: Voicemail Directory

in your subscribers mailbox select yes you want to be included in you companies directory .

SOURCE: How to change time on NEC Electra Elite IPK? I

You have to be on the root phone or "first phone".
To check various phones -Hit {feature} 4.
Should display 100= TEL 01. Once on the first phone then use {feature} 9 #.
Time will flash at top of display and can be adjusted.

If you are not on the first phone you will get error at the top of the display. Leave the hand set on the hook.