Number portability for telecommunication networks

Number portability-is a telecommunication network function, which allows subscribers to switch services, service providers, or locations without changing their telephone numbers; Near-term number portability is typically implemented by existing telecommunication services such as remote call forwarding. Long-term number portability can be implemented under the advanced intelligent network platform. In this article we introduce the number portability Issues and provide a tutorial on AIN. Then we show the AlN implementation number portability. Finally, a cache approach is proposed to speed up address transfer, which can effectively reduce the network overhead incurred by AIN query for number portability.