The Ooma Office VoIP Business Phone System uses your high-speed Internet connection to deliver a high quality business phone system. Its hybrid solution utilizes on-site hardware and the power of cloud computing to deliver advanced features and quality of service. There are no wires to deploy so installation is quick and simple. And what's more is Ooma Office has plenty of room to grow as your business expands, allowing you to add up to 5 phone extensions and 15 virtual extensions.