Ethereal-users: Re: [Ethereal-users] Voip sniffing

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From: Guy Harris <guy@xxxxxxxxxx>
Date: Tue, 14 May 2002 19:13:45 -0700
On Tue, May 14, 2002 at 06:32:40PM -0700, hecvillaf@xxxxxxxxx wrote:
> Really? So, there is no way of sniffing VoIP?

That depends on what you mean by "sniffing VoIP".

If you mean "there is no way to have a capture filter that will capture
*only* VoIP traffic", that's true, unless you already know, in advance,
what TCP and UDP ports the VoIP traffic will be using.

You *might* be able to use Tethereal in the fashion I described, using a
*display* filter to discard non-VoIP packets.