Business VOIP evolves on Internet time. There are new companies and networks coming online all the time. If you're considering Business VOIP, hire an expert consultant to help you choose and implement the correct system for you and you business. If you choose your consultant wisely, he will pay for himself with savings on set-up, maintenance and rates. And he or she will be there to help you if and when you need to upgrade or run into trouble. If you're a big business, you probably have the knowledgeable people in your IT staff. It's more of a cost imposition for small businesses, but worth it in the long run.