The IN technology is used as the platform to provide the Prepaid Service and billing application.

Its main concept is that exchanges only implements the most basic connection and transmission functions, and the creation of all the recharging services must be carried out by an additional network layer - the IN layer.

IN can create new telecom services rapidly, effectively, flexibly and economically without changing the hardware structure of the existing network.

It separates the service control from the service switching by means of standardized structures and protocols, with the exchange responsible for only the service switching function and the intelligent network is responsible for creating, generating and providing the services.

On one hand, it accelerates the creation of the services and promotes the user's participation.

On the other hand, because of the use of standard interfaces, the products of different manufacturers can inter-work flexibly and compete on an equal footing, which will undoubtedly improve the development and research of the intelligent network, lower the product price and bring benefits to both the network operators and users.