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

[EXT / LORE MATHEAU Franck]

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 !!!!

Franck

-----Message d'origine-----
De : discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] 
Envoyé : mardi 13 février 2007 19:27
À : discussion at sipforum.org
Objet : Re: [SIPForum-discussion] how often are RTP packets sent out?

Hi again,

I mean the end to end delay of an rtp packet from a sending to recieving device.

Can I tell this from ethereal? As ethereal just does delay between 2 packets. I have read about using RTCP packets for this but to not fulling understand.

How can I tell how often the continous stream of RTP packets are being sent out? Can I take results with no audio that will still give a good idea of delay/jitter etc?

Thanks,


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