While service providers were busy laughing at VoIP in the late nineties the one market that embraced VoIP and was responsible for keeping many VoIP players alive during the downturn were the prepaid calling card companies. Think about it, you have an unbranded (for the most part) service that doesn't require high levels of quality. Consumers were happy to speak so cheaply and weren't phased by dropped packets. The activity in prepaid isnt dead. In fact there seems to be lots of room for growth.. Here is a release from Epana Networks and Bay Packets about their latest collaboration to bring VoIP into the calling card business.