Re: jitter calculation example on wireshark wiki

[capricorn 80 <cool_capricorn80 () hotmail com>]

 Hi Lars!

 

  I guess in asterisk pbx case the traffice goes from server .. I am not sure but i read it long time ago but i will 
check it again.

  

  Since I am running wireshark on both end A -> B and B ->. so I can get jitter on both location.

 

  Although I am not very good in these calculations but I am trying my hard.

 

Regards,

 

 

   
 
> From: lars.ruoff () alcatel-lucent com
> To: wireshark-users () wireshark org
> Date: Tue, 23 Mar 2010 14:20:14 +0100
> Subject: Re: [Wireshark-users] jitter calculation example on wireshark wiki
>
>
> > If i run this at centralized place i.e Astersik pbx: will it give some additional information. I mean its hard to 
> > get end to end jitter but if i run it on centralized server than i can have both sides RTP.so is it possible using 
> > wireshark to just tell wire shark to calculate the jitter of both sides.
>
> Capturing on a central media point will only give you the incoming jitter on all segments. (Are you sure that RTP 
> really goes through your central point? Usually RTP is sent directly between media endpoints.)
>
> But if you assume symmetric conditions, that will give you a good overall picture.
>
> > Can you explaing this line -> network jitter is symmetric ?
> With "symmetric" i mean same conditions on direction A-->B as for B-->A.
> While this assumption is probably true in most cases for the mean (average) jitter over time, it is probably not true 
> for the jitter at a given particular time.
> But usually average values is all that you want.
>
> Regards,
> Lars
>
>
>
> ________________________________
>
> From: wireshark-users-bounces () wireshark org [mailto:wireshark-users-bounces () wireshark org] On Behalf Of 
> capricorn 80
> Sent: lundi 22 mars 2010 16:27
> To: wireshark-users () wireshark org
> Subject: Re: [Wireshark-users] jitter calculation example on wireshark wiki
>
>
>
>
> Hi lars!
>
> Thanks for your reply.
>
> If i run this at centralized place i.e Astersik pbx: will it give some additional information. I mean its hard to get 
> end to end jitter but if i run it on centralized server than i can have both sides RTP.so is it possible using 
> wireshark to just tell wire shark to calculate the jitter of both sides.
>
> Well right now i am doing is like this that I am running wireshark on both sides so i have RTP of A ---> B and B ---> 
> A. Can I by any mean calculate end to end jitter/delay ?
>
> Can you explaing this line -> network jitter is symmetric ?
>
> Regards,
>
> > From: lars.ruoff () alcatel-lucent com
> > To: wireshark-users () wireshark org
> > Date: Mon, 22 Mar 2010 11:20:42 +0100
> > Subject: Re: [Wireshark-users] jitter calculation example on wireshark wiki
> >
> > It is done on the receiver side.
> > I.e. if we consider an RTP stream direction A-->B, then we calculate jitter for B. For this we analyse all incoming 
> > RTP packets to B.
> >
> > So you need to run Wireshark on the end which recieves the RTP packets.
> > But since RTP conversations are usually both-ways and if you assume that network jitter is symmetric, then you can 
> > do it on either end.
> >
> > Hope that answers your question,
> > regards,
> > Lars
> >
> > ________________________________
> >
> > From: wireshark-users-bounces () wireshark org [mailto:wireshark-users-bounces () wireshark org] On Behalf Of 
> > capricorn 80
> > Sent: samedi 20 mars 2010 16:36
> > To: wireshark-users () wireshark org
> > Subject: [Wireshark-users] jitter calculation example on wireshark wiki
> >
> >
> >
> > Hi!
> >
> > The jitter calculation in aaa.pcap is done on the user side or server side? 
> >
> > As asterisk pbx uses centralized based approach in which every communication goes from server not like skype. Is it 
> > possible to calculate jitter by running wireshark on the server?
> >
> > Regards,
> >
> >
> > ________________________________
> >
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