To provide services without a physical switch, a softswitch is connected to a server (a Sun Microsystems or Unix machine, for instance) that runs the application. A softswitch is also connected to a media gateway, which is the element that physically connects to the PSTN, IP network or ATM network.
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Woffice comes with several built-in demos that you can install in one single click. You can test the available demos here and feel free to challenge any presented feature.