The document discusses on-site and hosted IPPBX systems. On-site systems involve purchasing and installing equipment on the user's premises, while hosted systems are cloud-based solutions managed remotely by a service provider. Both have advantages - on-site systems give users more control but are more expensive up front, while hosted systems are cheaper and lower maintenance but users have less control. The document provides examples of when different solutions may be appropriate based on a company's needs. It also outlines factors like ROI calculators, performance, and security that providers can highlight to help users determine the best option.