Abstract
There are companies and organizations providing customer service by means 080 toll-free phone. The special characteristic differing from the normal phone number is that the callers do not need to pay any calling fee, the calling fee was paid to the telecommunications by the callee. Consequently, the willingness to call to the service provider will be improved when the customers have questions to be solved. Also, Providing the toll-free phone helps the service provider a make good impression on customers. As people are required to provide the documents, id card to telecom service provider if they would like to apply for a toll-free phone. It takes about three days to activate the service. It is time-needed. Besides, we hope to make the toll-free phone more accessible to the personal service providers. Based on the above motivations, we design a more efficient system helping personal service provider building the toll-free phone service more easily and conveniently. Due to the growing popularity of smart phone devices, we decided to develop mobile applications on both Android and iOS. The application uses the cloud server to send HTTP requests to the Asterisk-based SIP (Session Initiation Protocol) server to bridge two phone calls on PSTN (Public Switched Telephone Network). By this approach, we can bridge two separated phone calls and make people communicate. The charging system is also implemented in our web service so that we can decide whom to be charged based on the calling time. In this thesis, we will evaluate the feasibility by a survey and describe how we implement this system including application, web service and the responsive website. At the end, I will make a conclusion about this system and discuss the future works.