Anyone Know of a Free Auto-Dialler compatible with NIPO CATi & FreePBX for a Call Center?

Hello,

We're trying to set up a Call Center, we'll be using FreePBX and NIPO CATI surveying system, and wanted to see if anyone can recommend a free auto-dialler?

Any insights on CATI, FreePBX or free auto-diallers, will be welcome too.