[SIPForum-discussion] RE : RE : RE : RE : how often are RTP packets sentout?

[CHANG Jenny]

Hi,
>From the following discussion ,I got the information about RTP delay test.
I have the same request about testing RTP delay/jitter /round-trip delay for voip service.
Does the OPERA measurement tool can test all of the above ?
And is it only a software tool and free too ?
If the tool is free ,where can I download it ? 


Enclosure: 
http://sipforum.org/pipermail/discussion/2007-February/001853.html


[SIPForum-discussion] RE : RE : how often are RTP packets sent out?
EXT / LORE MATHEAU Franck ext.lore.matheau at sncf.fr 
Thu Feb 15 10:09:39 EST 2007 

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For voice delay i use OPERA which is a measurement tool !

-----Message d'origine-----
De : discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] 
Envoyé : jeudi 15 février 2007 15:15
À : discussion at sipforum.org
Objet : [SIPForum-discussion] RE : how often are RTP packets sent out?

Excellent, thats exactly the explanation I was after!

Also, what is the best way to measure end-end RTP packet delay (from sender to reciever)if using Ethereal?

I guess it would have to be done manually as ethereal's version of delay is not end-end. Would calculations need to be done on the RTP packets or the RTCP packets etc?

Or are there specific softphones that will allow the end to end delay info to be obtained?

Thanks again,

Adam.


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Hello,
On a basis of 20 ms sample, 50 RTP packets are sent in one second.
The payload is 160 bytes for G711, so 160 * 50 * 8 = 64 kb/s.
If you activate voice activity detection, you can get only one RTP packet in one second !!!!




Best Regards
Jenny