Intelligent network services in migration from PSTN toward NGN

In this paper we propose two new scenarios for two IN services when migrating from public switched telephone network, PSTN toward next generation network, NGN. Next generation network is one of the promising networks in near future. Because of huge amount of investment on PSTN, the migration towards NGN implementation would be instant step by step and gradual not an instant replacement. . Therefore, we need to plan the interfaces between PSTN and NGN in order to convert data and signalling. By applying intelligent network services in PSTN, IN services scenarios will be changed while migrating to NGN. We assume that IN equipment is located in PSTN. We will propose two novel scenarios when users located in NGN request card calling and free phone services