Hosted private branch exchange (PBX) or hosted VoIP represent two of today’s most widely used phone system technologies. With hosted PBX, the phone system server resides in the provider’s data center instead of in the customer’s office. Voice and data traffic are routed over the public switched telephone network (PSTN) to the hosted system. Since the system is offsite, a hosted PBX offers web-based access to many features. These include configuring the system, defining how you want calls to flow, viewing call detail records, and billing information, listening to, and deleting voice mail.