...
Another issue that needs to be addressed is that of connecting your server to a public telephony network. This becomes of your concern especially when your server is in-house. To connect to such a network you will need a gateway that routes and translates calls between the two networks for the VoIP user. The telephone company provides one or more trunk lines to the customer for connection to the customer's PBX.
Getting the new hardware to do what you need: Setting up your software.
VoipNow is a platform that includes an IP PBX, billing engine, a browser interface and multi-tenant management. At the core of the VoipNow system lays the IP PBX, or Private Branch Exchange, is a private telephony network used within a company. It is a software application that implements the basic functions of a traditional hardware PBX as well as next generation digital services. Basically, it acts like an automatic switchboard that connects users. In addition, it offers new services that traditional telephony doesn't have the technology to.
...