Vonage themselves state:
The Regulatory, Compliance and Intellectual Property (RCIP) Fee covers regulatory, legal, intellectual property and compliance-related expenses, including those related to customer privacy protection, anti-fraud protection, number portability and innovation, all of which enable our services to enhance your communication experience.
The RCIP fee is not a government-mandated fee. It is a Vonage fee used to specifically cover some of the costs associated with:
Compliance with State Attorney General, FCC, FTC and other regulatory agencies' requirements across the country.
Ensuring customers can readily transfer their number to and from Vonage.
Gaining and protecting patents, filing global trademark and copyright registrations, and investigating, tracking and attempting to prevent fraudulent activity.
Conducting research and development activities for new products, such as Vonage Extensions and Vonage Mobile.
This is a taxable fee assessed monthly at $2.99 per voice line, fax line, Virtual Number, Toll Free number, and Softphone.
That's some spicy meatballs.
Vonage has been sued a few times by the Attorneys General of many states, and has reached settlements.
So now they charge the customer for making sure the company behaves!