eBay chief executive, Meg Whitman, at a press conference expressed to the investors that ¡§communications plays a key role in e-commerce and society. This makes Skype become the most suitable cooperator with eBay.¡¨ When integrating with Skype, eBay makes buyers and sellers communicate with each other through VoIP. This removes the biggest obstacle between buyers and sellers and achieves an ¡§unparalleled e-commerce and communications engine.¡¨ ¡§eBay with Skype¡¨ is the best example of 3PCC with e-commerce. 3PCC is a model that allows an entity (which is called controller) to manage and set up a communication between two or more other parties. It has already existed in the PSTN for a long time. Although there are many applications designed for SIP, they are not 3PCC with e-commerce model. Therefore, we attempt to design an application that integrating 3PCC with e-commerce. In this paper, we not only introduce how 3PCC is achieved but also express how REFER (a new method in SIP) can be used for replacing the traditional 3PCC mechanism in chapter 2. Chapter 3 will introduce the S/H development framework, the flows of SIP and the functions or libraries related to the Gateway. In chapter 4, we will first explain the design concept about our systems and then express how we implement the system. These include the website database structures, the Gateway programs and the packet analysis and verification. Finally, we will conclude this paper in Chapter 5. In addition, we will show the system and operation guide in appendix.

With the rapid growth of communication, applications in traffic sensor network such as the multimedia service Server Push, are indispensable to business advertising. The applications of server push, for example, the service Push Mail provided by ISP (Internet Service Provider), became much more hot and popular. This paper aims to design a mobile vehicular network to let the people who received the advertisement communicate with the providers of the service. Nevertheless, the handoff problem that arises when traveling brings down the quality of communication. Therefore, seamless handoff becomes a very important issue for us to research. This thesis uses the new SCTP (Stream Control Transmission Protocol) to solve the problem. SCTP not only keeps the advantages of TCP/IP but also provides new support. Allowing the user to own several IP addresses at the same time is one of its important characteristics, which allows you to switch to any other available IP immediately if the transmission is interruptted. With this characteristic, the user barely notices any interruption in the process of handoff. Finally, we propose a new design for SCTP to achieve a response time, and can be used in applications that require a fast response time.

This report presents several different techniques for diverting RTP streams when using a handheld mobile device. This device is running a version of Minisip as the SIP user agent. An introduction to the SIP protocol is given to provide some background to the reader prior to focusing upon the main goal: redirecting RTP streams. A set of requirements are defined and an RTP media transfer mode is chosen based upon these requirements. The requirements are derived from a study of a Linux cellular phone’s mobile device features and capabilities. Minisip was ported to this platform and a series of tests conducted to evaluate the design decisions made. These tests show that the best method of redirecting RTP media streams is third party call control (3PCC). / Den här rapporten presenterar flera olika teknikerna för att dra RTP strömar när man använder en mobil anordning. Den här anordningen löper en version av Minisip som den SIP användare agent. En introduktion till SIP protokoll är gjord för att ge läsaren någon bakgrund på focusen ovanför det huvudsakliga målet : omdirigerande de RTP strömarna. En set av bestämd behov är definierad och en RTP media transfer sätt är vald på grund av de här behoven. Behoven är härrörda från en studie över en Linux mobiltelefon. Minisip var installerad till den här plattformen och en serie av test dirigerad för att utvärdera de gjorda designsbesluten. De här testen visar den bästa metoden för att omdirigera RTP media strömar är den tredje part kalla kontrollen (3PCC).