System API is a SOAP web service available in Amernet that allows third-party software applications to manage accounts, configure extensions or charging plans, get usage information, manage call costs, and more.

SystemAPI is designed to control the VoipNow accounts related features. If you want to manage the telephony feature, please check the UnifiedAPI. The UnifiedAPI web service allows you to manage and get information about phone calls in real-time, receive events from PBX, as well as many other useful features.