Design and implementation of VoIP prepaid service based on RADIUS

The prepaid service is a valid method to assure the credit of users that is prevalent used by vendors at present, and it is a very important and applied function. Firstly, the generic AAA architecture and the work principle of RADIUS protocol used by prepaid service are introduced simply. Secondly, the system structure of VoIP authentication and accounting system based on RADIUS is described. Finally, this paper emphasizes on the implementation of the VoIP prepaid service. The results show that the prepaid service can enlarge the function of VoIP authentication and accounting system and validly control the customer credit.