Real-time communication over networks
Yi Liang, Yen-Chi Lee and Andy Teng
3.6.1 Introduction
Internet protocol (IP)-based real-time communication, including voice-over IP (VoIP), video telephony, and teleconferencing, has been gaining popularity in recent years. One example is VoIP, which has been competing with the traditional public switched telephone network (PSTN) for years and now enjoys increased market share. This is due to the many advantages of IP-based communication, including lower cost as well as the capability of providing integrated data, voice, and video, a larger variety of features, and more value-added services.
Despite rapid expansion and improvement of the underlying infrastructure, quality-of-service (QoS) ...
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