Softswitches are generally categorized into different classes based on certain applications.

Both Class 4 and Class 5 Softswitches are traditionally seen among telecommunications companies, more specifically in VoIP service providers.

Class 4 softswitches are used by VoIP carriers to safely route and monitor high amounts of VoIP voice traffic over long distances.

For example, let’s consider Class 4 softswitches as wholesale switches that sit at the intersection of local PSTN network and long-haul IP network.

When a call is made, class 4 switches ensure that the call is moved to the intended recipient taking an efficient route.

Alongside, Class 4 switches can also handle extra features like billing and call data reporting (number of concurrent calls, average time for routing, etc.)

Class 5 softswitches are intended to provide services for the end-users requiring local and long-distance VoIP telephone services.

These switches primarily deal with subscription telephone services and route the calls through local areas.

Class 5 softswitches along with routing comes with some additional features such as call forwarding, conference calls, voice mail, three-way calling, PBX features, and auto attendants.

It is generally used by VoIP providers, cell phone carriers, and PSTN carriers to connect to each other.

The biggest advantage of class 5 Softswitch is, it can be installed on any server and it does not need to have on customer premises.

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