Ringing is assigned in system programming, very little chance it was changed by mistake. If Do-Not-Disturb was turned on, that could make a phone stop ringing. If it's just one line on a phone, maybe the system got put in night mode by mistake and night programming isn't identical to day ring. If you have direct access to the phone line check it for dial tone. Often virtual lines are used and you can't check for direct dial tone. On very rare occasion the ringer stops working, which can't be fixed.
SOURCE: NEC DTU 16D-2 issue
hi,1.to adjust the ring tone volume. from your phone set,press speaker dial 601.press the arrow key up or down to adjust. 2. if your station is programmed as system admin phone,then you can press feature 80 feature.to toggle between day or night.do not press speaker button while doing this. 3.the headset port need to be program,or you can do without it,by purchasing the headset came with the adapter and connect thru the handset cord. the new model is DTH-16D. CAN email me if you need a new phone, [email protected]
SOURCE: Blinking light but no ring sound on incoming calls
This is a phone system phone and each station you want to ring when a certain phone line rings has to be programmed into the system. This is not something you can change at the phone itself. You will either need to pay a company to make programming changes or locate a programming and installation manual for your phone system (not the phone) and try to re-program it yourself. If you have not done this before it will not be easy but it may be worth the effort so you can continue to make your own changes instead of paying someone $200 per hour to do it for you. There is also the remote possibility your phone's ringer is broken. You can try swapping your phone with another of the same type and model to see if it will ring.
SOURCE: I need to program a HeadSet Button
For the DTU phone on an NEC Elite system:
Memory Block 4-12
put in the port number and the Lkey of the extension you want to make a headset key.
Programmin on a 16button phone, Lkey 11 needs to be lit and will display H SET to verify.
For the DTP phone, it is generally on an NEC 2000, which is entirely different.
SOURCE: NEC DTU-16D-2 Phone manual
Here's the manual for all NEC Electra Elite =>
http://www.chickasawtel.com/pdf/manuals/elitemultilineug.pdf
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