Abstract
With the pervasive use of the Internet services and the fact that the mobile devices are affordable for almost everyone, social communications like IM (Instant Messaging) and VoIP (Voice over Internet Protocol) through the Internet therefore become more and more thriving. A variety of applications have been developed to cater to all kinds of user needs, but the increasing usage of network is inevitable and so is the cost of monthly fee. In order to save the user’s cost, we have developed a system called CBS (Cloud Bridging System) that takes advantage of both the Internet service and PSTN (Public Switched Telephone Network) service by sending the requests of call by apps and redirect the phone calls to PSTN by SIP (Simple Initiation Protocol) server and hence lowers the usage of Internet. This thesis starts with an introduction to the whole system and then focuses on the implementation of the client side software on iOS smart devices including the MVC (Model-View-Controller) structure, SIP client and the conference arrangement. This thesis proposes a novel cloud-based online communication system, which can lower the usage of the Internet service while enhances the quality of communication. By using the proposed system, users can easily start calls or initiate conference calls and host the conference calls by apps. At last, we improve the app’s performance to handle the contacts’ data to make it fully UI responsive to user and provide real-time status of every user in the conference call for host in an efficient way.