Software that performs call routing, control, and billing functions in a VoIP network, replacing the hardware switches used in traditional telephone networks.
A softswitch decides where each call goes. It applies dial plans, chooses among carrier routes based on cost, quality, and capacity, enforces customer permissions, and generates the call detail records used for billing. In wholesale networks, the softswitch is often the center of least-cost routing and partner management. It also maintains the customer and carrier configuration that determines what each account is allowed to do.
Class 4 softswitches focus on routing large volumes of traffic between carriers, while Class 5 softswitches provide subscriber features such as voicemail, call forwarding, and hunt groups. Many modern platforms combine elements of both. Smaller providers frequently run a single platform that handles both roles, while larger networks separate them for scale and resilience.
Because the softswitch knows which customer sent each call and which route it took, it is a natural integration point for attestation decisions, fraud controls, and compliance reporting. Changes to routing or customer settings made there also take effect immediately, which makes it a fast and precise place to respond to an incident.
Why it matters to carriers
Fraud and compliance tools are only as good as the data and control points they can reach. Integrating with your softswitch lets you attribute every call to a customer and route, block or reroute suspicious traffic in real time, and produce the records you need for tracebacks and audits without manual work.