NEC DSX Systems-PHONE DSX 22Button Display BK

- program ringing on the NEC DSX telephone you want to go to the extension that you want to set as ringing or not ringing in this case we're at extension 300 with the handset down press pound seven to five now you can see on the display it says select line key and my lines one through eight have all turned solid green now if I wanted to program line five to not ring you simply press the line five button until it turns solid red and you'll notice that the display reads lamp only what this indicates is that when a call comes in on line five the button for line five here will flash but the phone will not actually ring you also have the option of night ring which means this extension will only ring on line six during the night mode or a delay ring the delay ring says that the phone will only ring after the other phones in the office have rang three or four times depending on your programmin