dialer for vtiger-integration

I had a previous project to integrate my VoIP Server with vTiger. This has been completed. I now have a custom module loaded in vTiger which allows me to click to dial, and when incoming calls arrive, it goes tothe lead screen. Now I need to refine this facility. I need the predictive dialer softphone to be integrated with vtiger, I must be able to create a campaign, upload leads, allocate agents to it, and it must auto-dial the leads as soon as agents login to the vtiger phone. I would prefer if you've already done this work before, as it seems this project has been already done many times before. If you have any Call center modules, template or anything which enhances vTiger into a call center facility, i'm interested in buying it. Please let me know [login to view URL]'re ready to do business!