RTP

Real-time Transport Protocol (RTP)

RTP, the real-time transport protocol. RTP provides end-to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. RTP does not address resource reservation and does not guarantee quality-of-service for real-time services. The data transport is augmented by a control protocol (RTCP) to allow monitoring of the data delivery in a manner scalable to large multicast networks, and to provide minimal control and identification functionality. RTP and RTCP are designed to be independent of the underlying transport and network layers. The protocol supports the use of RTP-level translators and mixers.

History

The RTP RFC is dated January 1996

Protocol dependencies

UDP: Typically, RTP uses UDP as its transport protocol. RTP does not have a well known UDP port (although the IETF recommend ports 6970 to 6999). Instead, the ports are allocated dynamically and then signalled using a different protocol such as SIP or H245. In SIP and other protocols a RTP session is described by SDP (Session Description Protocol), which is not really a protocol itself but rather a formalised way to describe a media session.

Example traffic

Screen shot of a RTP frame from SampleCaptures file: rtp_example.raw.gz

Ethereal

The RTP dissector is (fully functional, partially functional, not existing, ... whatever the current state is). There are detailed RTP statistics available.

Preference Settings

(XXX add links to preference settings affecting how RTP is dissected).

Example capture file

XXX - Add a simple example capture file to the SampleCaptures page and link from here. Keep it short, it's also a good idea to gzip it to make it even smaller, as Ethereal can open gzipped files automatically.

Display Filter

A complete list of RTP display filter fields can be found in the display filter reference

Show only the RTP based traffic:
```
 rtp 
```

Capture Filter

You cannot directly filter RTP protocols while capturing. However, if you know the UDP port used (see above), you can filter on that one.

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