Five9's VoIP system is the first predictive dialer that operates both over the Internet as well as the plain old telephone system (POTS).
"[The] Internet Predictive Dialer also allows for the first true remote agent on an outbound campaign. All your agents need to do is log onto the Internet, plug in their headsets, and they can be taking live predictive dialer calls from anywhere in the world -- toll-free internationally."
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five9.com/news/newsInetPD.jsp