A VoIP switch or soft-switch is a server device used for connecting IP based telephone calls. The VoIP calls are routed over the Internet from origination to destination, meaning from IP based networks to circuit based networks (PSTN).
Internet telephony service providers (VoIP providers) use VoIP switch to provide origination and termination services / solutions. They can manage all VoIP based services such as:
And many more...
There are two types of VoIP softswich and classified as:
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SoftSwitch by Wikipedia