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

[Nelson Pereira]

Don't you mean:

> G711 20 ms => 160 bytes of payload
> G711 30 ms => 240 bytes of payload
> 
> G729 20 ms => 20 bytes of payload
> G729 30 ms => 30 bytes of payload
> 
 

> -----Original Message-----
> From: discussion-bounces at sipforum.org 
> [mailto:discussion-bounces at sipforum.org] On Behalf Of EXT / 
> LORE MATHEAU Franck
> Sent: Thursday, February 15, 2007 10:47 AM
> To: Terence Xie
> Cc: discussion at sipforum.org
> Subject: [SIPForum-discussion] RE : RE : RE : how often are 
> RTP packets sentout?
> 
> Yes, codec and sample size define RTP packet size.
> Here is a list of payload's size without headers (ip, Ethernet...)
> 

> 
> Franck
> 
> 
> 
> -----Message d'origine-----
> De : Terence Xie [mailto:terence at atrillium.com] Envoyé : 
> jeudi 15 février 2007 16:43 À : EXT / LORE MATHEAU Franck Cc 
> : Adam Harding; discussion at sipforum.org Objet : Re: 
> [SIPForum-discussion] RE : RE : how often are RTP packets sent out?
> 
> Hi,
> 
> Can I control the size of the RTP packet? If I set the 
> smaller size of the packet, will the RTP packets sent out 
> more frequently?
> 
> Thanks
> 
> Terence
> 
> EXT / LORE MATHEAU Franck wrote:
> > 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.
> >
> >
> > --------------------------------------------------------
> >
> > 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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> 
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