Prepaid & postpaid calling
According to Ezine, Postpaid [calling] is the term used to refer to a plan where phone bills are paid on a monthly basis. All of the services you have availed for with their corresponding prices will be added up by the phone company and will be sent to you as a bill.
On the other hand, prepaid [calling] is the term used to refer to a scheme that would let you avail of the phone company's services depending on the credits you have left on your prepaid card. You will not be able to use services of the company if you do not have enough credit.
TelcoBridges and prepaid & postpaid calling
TelcoBridges' Toolpack software and Tmedia & Tdev devices support the development of prepaid & postpaid calling applications, such as calling cards. Both families of devices support the deployment of applications that require validation with a database before a call is authorized. For larger scale scenarios, the Tdev platform is recommended.
TelcoBridges partners around the world have developed and deployed such prepaid & postpaid calling applications.