It’s hard to describe in few words. You should better go through the doccumentations you received in Quintum CD. You will find at least one application note for this kinda application. I’ve tested it and it works.
I whant start prepay card service for long distance (customers ring to an phone number) this is an service for local users .
But i whant an particular categori (customers acces service voip by internet with an special application, netmeeting by example ) in this case customers can be in other town .