The VoiceXML prepaid system for SI3000 (VPSS) provides a complete prepaid solution for any voice operator. The VPSS is best suited to a voice service providers that do not have another prepaid system or subscriber database (e.g. RADIUS, LDAP server), because the VPSS does not require any external component. Therefore, the VPSS is the best solution for a fast and cost-effective voice service operation start-up.