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

[EXT / LORE MATHEAU Franck]

Sorry for mistake :

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


Franck


-----Message d'origine-----
De : discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] 
Envoyé : jeudi 15 février 2007 16:47
À : Terence Xie
Cc : discussion at sipforum.org
Objet : [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...)

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

G711 20 ms => 20 bytes of payload
G711 30 ms => 30 bytes of payload


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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