Ethereal-users: Re: [Ethereal-users] VoIP-capture low quality

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From: gmx-griM1 <griM1@xxxxxx>
Date: Wed, 23 Nov 2005 13:47:35 +0100
hi,
i noticed a lot of "Wrong sequence nr." errors while using the "RTP Stream 
Analysis", so i think these packets get thrown away. my question is how "RTP 
Stream Analysis" handels these errors? is the remaining stream-payload 
streached over the time of the stream (what maybe explains the dull sound)?

im also interested why the "Wrong sequence nr." occurs. i readed that this 
problem is sometimes caused by packet-loss. is packet-loss related to 
system-performance?

thanks you for your help, grim

Am Montag 21 November 2005 12:32 schrieb gmx-griM1:
> hi.
> for a university-project i want to capture voip calls within a
> laboratory-environment. i use ettercap to perform the mitm-attack and dump
> udp with tethereal. this is done from a ssh-session. then i copy the dump
> to my local system and analyze it with ethereal. works fine exept sometimes
> there is a low quality. it seems that the call is 'streched', so it sounds
> very dull and sometimes you cant even understand a word.
> im not sure what is the reason for this problem and if this is
> ethereal-related. any experiences?
>
> thank you, grim