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That means either a problem on your phone line - through which you get internet - or a problem with the internet service over that line - or a defect in your Netvanta 3133.
For the phone line service, check with your phone company.
For the internet service, check with your DSL internet service company (which might be the same as your phone company).
And if the first two have no problems, either a reset, or a replacement of your Netvanta box is indicated.