From their site: the Jaduka API gives developers direct access to, and all the inherent benefits of, the world's highest-quality, ubiquitous public switched telephone network (PSTN). Based on common Web standards, the API facilitates quick and easy development of virtually limitless voice-enabled business applications that can be used with any existing telephone -- wired, VoIP or wireless.
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So far, we don't have a record of any changes to this API