For decades, researchers have worked extensively in the area of congestion control for packet-switched networks. Many proposed solutions take advantage of the congestioncontrol mechanism in Transmission Control Protocol (TCP), and these approaches work well for networks that have heavy TCP traffic. However, these approaches are not universally effective they fail completely for protocols that do not implement congestion-control mechanisms. In particular, these approaches do not work with the User Datagram Protocol (UDP). Realtime media-streaming technologies such as Voice over Internet Protocol (VoIP) and video conferencing use UDP and therefore do not respond well to existing congestion-avoidance techniques. We propose a new, adaptive, responsive, end-to-end technique to implement application-level congestion detection and control for real-time applications such as VoIP. Unlike existing methods, which rely on packet loss as a signal to reduce the transmission rate, our solution reacts to network congestion to prevent packet loss, thus improving the QoS of applications that employ our algorithm.