I have the NEC electra elite ipk multiline phone system in my office and only one phone rings when a call is incoming. how can i get all phones to ring?

SOURCE: I have sixteen button NEC Electra ELite Multiline Telephones in my office-

I have a electra elite 48, need to know how to turn the ringing off and on at stations??? Some don't ring on incoming calls. Thanks

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: Changing amount of rings when going to voicemail

The call forwarding was turned off. To turn on, press speaker, enter 793, press 1(for set), press extention number, and enter 300. If you have call forwarding on and are looking for more rings, do the above steps except press 2 (for clear).

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.