Hi Grim,
The RTP payload saving in Ethereal is very bare bones. It spits them out
as it sees them, no jitterbuffer to resequence. When saving the payload
this can result in drops and dull sound.
Saving the RTP stream in RTPdump format may help, giving an external
application the opportunity to do the resequencing.
Packet loss is related to system performance, question is which system? Is
it the host itself or the network components, like a switch or router
handling too much data. The chain is as strong as the weakest link.
Thanx
Jaap
On Wed, 23 Nov 2005, gmx-griM1 wrote:
> 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
>
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