What kinds valume of minutes are you talking about? You can get two 4 port Quintum A400 ($800 each)to leverage both FXO and FXS ports (FXO for remote callers while FXS for walk in callers, providing you can intstall the Quintums in a call shop or cyber cafe environment). If you only use the FXO ports, you are limited to 4 calls at any given time. There are few groups out there will be able to do remote RADIUS/AAA/IVR service for you with a low up front cost and monthly fee. Good way to get things started until you have the business going. Two Qunitum plus setup I think you are looking at $3500 max.