A voice browser is a system that enables telephone access to voice portal sites. It prepares and presents information to callers. It also interprets commands and enables navigation. Architectures and implementations vary, but many will use VoiceXML or a similar protocol to access the portal application. This is sometimes called a VoiceXML gateway.
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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.