Syed,
If you want to run a real call shop or calling card application, then you will need a radius server to work with the Quintum. There are many out there from cheap, FreeRadius (requires you to do much modification), to more expensive, QiiQ Eyebill, etc.
Then you need to config the Quintum, which I can provide assistance on.
Mikem
mike_voip@hotmail.com