Ethereal-users: [Ethereal-users] Re: [Ethereal-dev] Capture RTP/RTCP

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From: Guy Harris <guy@xxxxxxxxxx>
Date: Mon, 29 Apr 2002 12:05:16 -0700
On Mon, Apr 29, 2002 at 08:40:11AM -0500, David Frascone wrote:
> Ethereal would have no problems capturing the stream. . . .  The problem is
> identifying the stream.  Most protocols that use RTP (or a flavor thereof)
> negotiate the port internally.  (Kinda like FTP does).
> 
> So, for example, if you're doing voice over ip using SIP+RTP, inside the
> SIP conversation, it would specify what ports the RTP would be sent/received
> on. 
> 
> Since dissectors are called based on protocol/port . . I don't see this being 
> implemented any time soon.

What do you not see being implemented any time soon?  Presumably you're
not referring to, for example, having the RTSP dissector set up a
conversation between particular IP addresses and ports to be dissected
as RTP, because Ethereal's done that for ages.

I don't know whether the SIP dissector will be changed to do the same at
any point, however.