The default RTP media port — the audio and video of a call, with RTCP next door on 5005.
IANA registers 5004 as avt-profile-1, "RTP media data", the default for RTP under the audio/video profile of RFC 3551; the odd port above it carries RTCP. In practice signalling on SIP or RTSP negotiates a dynamic even port for each stream, so 5004 is the textbook default rather than a fixed rendezvous, and it turns up on softphones, IP cameras, and encoders that never changed it. RFC 4571 defines the framing when RTP has to run over TCP instead of UDP.
Expose with care
Plain RTP is unencrypted media: anyone on the path can record the call. Use SRTP, and keep the media port range reachable only from the signalling peers that need it.
$ sudo tcpdump -ni any udp port 5004Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.