Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I take it that your problem is with Vonage VoIP phone connection - since you have named a Vonage box phone adapter.
What is the new internet provider, and is it Time Warner Cable, by any chance, please?
And, what was your former internet provider, please, also... it may matter to the case.