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Multimedia over IP (MOIP) is one of IP-based realtime communication that has been gaining popularity in recent years. Quality-of-service (QoS) is still one of the major challenges in real-time communication over IP networks. Excessive delay severely impairs communication interactivity, while packet loss results in glitches in audio and poor picture quality and frozen frames in video. In this paper, we perform a survey of the existing active transmission technique. We list out several features and functionalities for research continuity in this area.