No connection for my Vonage phone

I have macs and four vonage phones. I am sure I can help, but I do need all the information. How do you have it connected, what is your current provider, and how do you have your network set up in your home?
Are you using wireless?
That is where I would start. Vonage, doesn't like wireless. It needs to be plugged directly into a hard line or box that is connected into a wall. (Learned this the hard way).