[pjsip] [SIPRTP] lot of percent loss for TX results

antoine duclaud antoine.duclaud at gmail.com
Mon May 19 08:19:38 EDT 2008


i'm running pjsip on debian etch OS...

Okay so I think there is no problems... I have prefer to asks questions to
be sure! I'm student and in a training course so I am not sure!

Thanks!

2008/5/19 Benny Prijono <bennylp at pjsip.org>:

> On Mon, May 19, 2008 at 8:18 AM, antoine duclaud
> <antoine.duclaud at gmail.com> wrote:
> > For high, I have for example a rtt up to 1000 ms and jitter up to 7ms...
> > sometimes more... I think it's just a peak at the beginning but i'm not
> > sure.
> >
>
> Okay. But 7 ms is not bad IMO, considering that we're running siprtp
> on general purpose OS and not a real-time one (we use
> pj_thread_sleep() for scheduling packet). Also the RTCP will ignore
> the first 25 RTP packets (25 is controllable via
> PJMEDIA_RTCP_IGNORE_FIRST_PACKETS setting) on jitter calculation.
>
> Not sure about the RTT value. But check if you have "clock skew
> detected" message in the log. When this happens it will screw up the
> RTT calculation. What OS are you running siprtp on? The clock skew
> happens a lot on Windows, but if I recall correctly it doesn't happen
> on Linux.
>
> > I have some packets in reorder too for the RX stats.
> >
>
> Okay. It's good then at least siprtp is able to report them. :)
>
> Cheers
>  Benny
>
>
> > Thanks!
> > Antoine
> >
> > 2008/5/16 Benny Prijono <bennylp at pjsip.org>:
> >>
> >> On Fri, May 16, 2008 at 2:12 PM, antoine duclaud
> >> <antoine.duclaud at gmail.com> wrote:
> >> > Hello!
> >> >
> >> > I use siprtp for test a liaison between two sites, and I have see that
> >> > for
> >> > the TX results, I have a lot of percent loss, 99% at the beginning of
> >> > the
> >> > test...
> >> >
> >>
> >> Okay.
> >>
> >> > But the results of RTT and Jitter are high too. How the results of RTT
> >> > and
> >> > jitter can be calculated if there are all packet losts?
> >> >
> >>
> >> Jitter is only calculated when the sequence numbers of the subsequent
> >> RTP packets are adjacent, so packet lost should not affect the
> >> calculation. And RTT shouldn't get affected by packet lost either, as
> >> all the information is conceived in one RTCP RR packet.
> >>
> >> How high is high? (what's the value reported by siprtp?)
> >>
> >> Cheers
> >>  Benny
> >>
> >>
> >>
> >> >
> >> > Is it a problem in the siprtp or it's my liaison that causes that.??
> >> >
> >> > Thanks!!
> >> >
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