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RTP Media Data
Port 5004 is primarily used for carrying Real-time Transport Protocol (RTP) media streams, as specified in RFC 3551 and RFC 4571. RTP is designed for delivering audio and video across IP networks with minimal latency, making it the core protocol behind most real-time audio/video communication services such as VoIP, video conferencing, and streaming media delivery..
The Real-time Transport Protocol (RTP) enables end-to-end delivery of audio, video, and multimedia over IP networks. Defined in RFC 3551 and RFC 4571, RTP provides framework functions such as payload type identification, sequence numbering for packet loss detection, timestamps for synchronization, and delivery monitoring.
Port 5004 is commonly assigned for RTP media data carriage. While RTP often works alongside the Real-time Control Protocol (RTCP) typically on port 5005, port 5004 is dedicated to the media data streams themselves. RTP packets encapsulate real-time content, such as voice or video frames, wrapped in UDP or TCP datagrams. Although UDP is traditionally favored for low latency transmission, port 5004 can also be negotiated for use over TCP to avoid UDP restrictions or improve firewall traversal.
In practical deployments, RTP over port 5004 supports applications in IP telephony (VoIP), video conferencing, live video streaming, and other interactive multimedia services. It is widely implemented by communication protocols and platforms including SIP, H.323, WebRTC, and streaming servers and clients.