Spend an hour and a half with Matt Florell talking about VICIDIAL, the Open Source Call Center software, and plenty of other subjects including CentOS, Ubuntu, resource issues, hardware for robust asterisk systems.
VICIDIAL is an enterprise class, open source, call center suite in use by many large call centers around the world.
VICIDIAL has a full featured predictive dialer. It can also function as an ACD for inbound calls, or closer calls coming from VICIDIAL outbound fronters. It is capable of inbound, outbound, and blended call handling. VICIDIAL even allows you to have agents logged in from remote locations.