You get a bunch of phone lines from the telco, which you pay for by line with unlimited outbound long distance. Then you get one or more digital telephony cards

You get a bunch of phone lines from the telco, which you pay for by line with unlimited outbound long distance. Then you get one or more digital telephony cards [0] depending on how many lines you have. Finally, you install your choice of media server/autodialer and start annoying the masses. [0]: http://www.sangoma.com/products/digital-telephony-cards/ http://www.sangoma.com/products/digital-telephony-cards/