If you want Vonage on every phone jack in your house (rather than just the one phone plugged into the box), you must disconnect your home wiring from the traditional telephone company's lines outside the house (the NID box). Failure to do this can damage the Vonage adapter due to voltage from the old phone line.
Plug one end of an Ethernet cable into the (labeled "Internet") on your Vonage Box. vonage install
This typically involves the Vonage "Phone Adapter" (often a device like the Grandstream HT801 or similar ATA). If you want Vonage on every phone jack
Getting Started: A Step-by-Step Guide to Your Vonage Installation vonage install