How can I make 100+ calls a day on the computer?

I am currently working on a research study where we are having to call over 100 participants a day. We began by using Google Voice, by it will no longer allow us to use the service. Skype will only allow up to 50 calls a day even on their unlimited plan. Are there any possible programs or software that we could use... show more I am currently working on a research study where we are having to call over 100 participants a day. We began by using Google Voice, by it will no longer allow us to use the service. Skype will only allow up to 50 calls a day even on their unlimited plan. Are there any possible programs or software that we could use that is reasonably cheap?
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