Implementação de um serviço de audio/video conferência usando o protocolo SIP

Dissertação de Mestrado em Engenharia Informática apresentada à Faculdade de Ciências e Tecnologia da Universidade de CoimbraNowadays, telecommunications are spread worldwide and play an important role on our life as well asthe Internet which is used with several objectives(work, play, chat and allows quick and easily get access to multimedia content. To be able to compete with the Internet, the telecommunications industry had to come up with new ways of delivering services and multimedia content, using standards and providing compatibility across the operators. From this need, 3GPP created the IP Multimedia Subsystem (IMS) network architecture. Another response emerged from the telecommunications world to reverse the revenues loss that has been happening on the last few years. The creation of the Rich Communications Suite (RCS) specification provides the user new ways of sharing content with others, in order to keep up with the type of services offered on applications categorized like Over The Top Content, that provide to the user features like calling or chatting without generating any revenues to the user's service provider. On this project a new feature is added into RCS which allows a user to place a conference call amongst several other users with the click of a button, enabling also a set of value-added functionalities on these calls