Just saw the following article:

http://next-gen-network-solutions.tmcnet.com/topics/next-gen-network-solutions/articles/256165-ivr-technologies-shares-insight-launching-retail-carrier-services.htm

Instead of going cheap with an entry level system that is undoubtedly going to fail you can now get the carrier-grade Talking SIP platform at an unbelievable price. Contact www.ivr.com for more information.

We have been using the Talking SIP platform for 8 years now and it has been rock solid and is the cornerstone of our business.

If you are in the market for a calling card/VoIP platform then I highly recommend Talking SIP because the product is great and so is their support and documentation.