and II.A) in paper Optimization of Large-Scale RTCP Feedback Reporting in Fixed and Mobile Networks Further research and development of RTCP
Mathematical background could be read in section I. Here is a diagram explaining how this calculation is performed. The RTCP dissector can do this calculation (see preference settings above) which is described in 6.4.1 of RFC3550. However, if you know the UDP port used (see above), you can filter on that one. You cannot directly filter RTCP protocols while capturing. Show only the RTCP based traffic: rtcp Capture Filter Display FilterĪ complete list of RTCP display filter fields can be found in the display filter reference SampleCaptures/rtp_ (libpcap) A VoIP sample capture of a H323 call (including H225, H245, RTP and RTCP). * Minimum roundtrip calculations to report(ms). * Try to decode RTCP outside of conversations. There are four preference settings affecting RTCP. Type: TOOL (name/version of source app) (6)
Real-time Transport Control Protocol (Source description) = Version: RFC 1889 Version (2)Įxtended highest sequence number received: 28620ĭelay since last SR timestamp: 0 (0 milliseconds) Instead, the ports are allocated dynamically and then signaled using a different protocol such as SDP and H245.Įxample traffic Real-time Transport Control Protocol (Sender Report)ġ0. RTCP does not have a well known UDP port. UDP: Typically, RTCP uses UDP as its transport protocol.RTCP was first specified in RFC1889 which is obsoleted by RFC3550.
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