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Is P-KISS-SBC a VoIP softswitch ?

A softswitch is a software component of a telecoms network used to connect calls between subscribers or other telecoms equipment.

There are 2 categories of softswitch: class 4 systems and class 5 systems. This classification is an analogy with switched telephone networks.

A class 4 softswitch is used to transport VoIP flows between operators; it is an interconnection solution. A class 5 softswitch, on the other hand, is designed to provide a telephony service to end subscribers, like an IPBX for example.

And to answer the question, yes, P-KISS-SBC is a class 4 softswitch.