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Wireshark-users: Re: [Wireshark-users] jitter calculation example on wireshark wiki

From: "RUOFF, LARS (LARS)** CTR **" <lars.ruoff@xxxxxxxxxxxxxxxxxx>
Date: Tue, 23 Mar 2010 14:20:14 +0100
>  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@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of capricorn 80
	Sent: lundi 22 mars 2010 16:27
	To: wireshark-users@xxxxxxxxxxxxx
	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@xxxxxxxxxxxxxxxxxx
	> To: wireshark-users@xxxxxxxxxxxxx
	> 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@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of capricorn 80
	> Sent: samedi 20 mars 2010 16:36
	> To: wireshark-users@xxxxxxxxxxxxx
	> 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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