This blog post will explain what a VoIP software switch is. VoIP software switches can be classified as class 4 and 5 software switches. Software switches can be used as a VoIP server. It is a node in a telecommunications network that handles the connection from one phone number to another. A class 4 software switch intersects between the pstn network and IP network. Typical phone numbers used these days are pstn and VoIP numbers. A good example of a class 4 and class 5 software switch is a2billing. Class 4 software switches transmit VoIP traffic between carriers or long distances. Their purpose is to route calls, convert protocols, trans code voice data, calculate the calls per second rate, and count the number of concurrent calls. Class 5 software switches are meant to serve subscribers. Services offered could be three way calling, conference calls, voicemail, auto attendants, and call forwarding.