[Serusers] Re: Xten-RTPProxy choppy audio

Klaus Darilion darilion at ict.tuwien.ac.at
Wed Dec 10 17:45:37 CET 2003


Hi Adrian!

Does your media proxy also forward RTCP packets?

Klaus

> -----Original Message-----
> From: Adrian Georgescu [mailto:ag at ag-projects.com] 
> Sent: Wednesday, December 10, 2003 5:44 PM
> To: Ricardo Villa
> Cc: serusers at lists.iptel.org
> Subject: Re: [Serusers] Re: Xten-RTPProxy choppy audio
> 
> 
> Interesting, did you try my media proxy before saying this?
> 
> Regards,
> Adrian
> 
> 
> On Wednesday, Dec 10, 2003, at 17:40 Europe/Amsterdam, Ricardo Villa 
> wrote:
> 
> > I can confirm this too.  Just tried it in our lab with the 
> exact same
> > results as Klaus.  (Instead of Budgetone I used ATA186).
> >
> > X-Lite build 1084
> >
> > 1.  ATA186 Calls Xten.
> > 2.  Xten hears choppy audio every 5 seconds or so.
> > 3.  RTP Stream from ATA to Xten is perfect and conserves 
> the same SSRC
> > 4.  RTP Stream from Xten to ATA switches to a new SSRC every few 
> > seconds.
> >
> > It is clear to me that there is a bug in Xten software.  Before Xten
> > switches to a new SSRC it attempts to send an RTP packet to 
> the wrong 
> > RTP
> > Port (it tries to the actual port +1).   SER server sends 
> back "ICMP 
> > Port
> > Unreacheable (Obviously)" and Xten restarts RTP Stream on a 
> new SSRC.
> >
> > I did not see any problem with Maxims RTPProxy.
> >
> > Regards,
> > Ricardo
> >
> > ----- Original Message -----
> > From: "Klaus Darilion" <darilion at ict.tuwien.ac.at>
> > To: "Jan Janak" <janak at fokus.fraunhofer.de>; "Adrian Georgescu"
> > <ag at ag-projects.com>
> > Cc: <serusers at lists.iptel.org>; "Ricardo Villa" <ricvil at epm.net.co>
> > Sent: Wednesday, December 10, 2003 11:07 AM
> > Subject: RE: [Serusers] Re: Xten-RTPProxy choppy audio
> >
> >
> > I can reproduce the choppy audio
> > setup:
> > budgetone-100 <----> ser+rtpproxy(version from today) on 
> redhat 9 (or 
> > 8,
> > not sure) <------>x-lite build 1088 on win xp
> >
> > the choppy sound occours every 5 seconds, in both directions.
> > RTP-analysis:
> > RTP stream from budgetone to x-lite (via rtpproxy) is fine 
> (no jitter,
> > no loss)
> > RTP stream from x-lite to budgetone (via rtpproxy): very strange: 
> > x-lite
> > switches to a new SSRC (and seq-nr. start at 0 again) every 
> 5 seconds.
> >
> > so, in my opinion: rtpproxy works fine, x-lite is guilty. 
> but why does
> > this happen only if the rtp proxy is involved? ...further 
> > investigations
> > are planned...
> >
> > Klaus
> >
> >> -----Original Message-----
> >> From: Jan Janak [mailto:janak at fokus.fraunhofer.de]
> >> Sent: Wednesday, December 10, 2003 4:09 PM
> >> To: Adrian Georgescu
> >> Cc: serusers at lists.iptel.org; Ricardo Villa
> >> Subject: Re: [Serusers] Re: Xten-RTPProxy choppy audio
> >>
> >>
> >> Well, we can generate the traces locally, but I haven't 
> encounter the
> >> problem you describe so it makes no sense.
> >>
> >> You wrote you are able to reproduce the problem, in that 
> case I would
> >> like to ask you to generate the traces that show the problem
> >> so we could
> >> analyze and fix it.
> >>
> >> Also please tell us on what OS does this happen ? (I mean the
> >> OS the proxy
> >> is running on).
> >>
> >> Another question, what is the license of your RTP proxy ? I
> >> didn't find
> >> any licensing info in the sources. Will the sources be available ?
> >>
> >>  Jan.
> >>
> >> On 10-12 16:04, Adrian Georgescu wrote:
> >>> On Wednesday, Dec 10, 2003, at 15:48 Europe/Amsterdam,
> >> Ricardo Villa
> >>> wrote:
> >>>
> >>>> Adrian,
> >>>>
> >>>> Do you have an Etheral trace trace of such a call (using G711)?
> >>>
> >>> I guess  ethereal traces can be generated with ethereal 
> program and
> >>> decoded locally on your servers if you want to isolate this.
> >>>
> >>>> I can
> >>>> decode it and produce an audio file for all to examine.
> >> This way we
> >>>> can get
> >>>> to the bottom of this.
> >>>> Thanks,
> >>>> Ricardo
> >>>
> >>> _______________________________________________
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> >>> serusers at lists.iptel.org
> >>> http://lists.iptel.org/mailman/listinfo/serusers
> >>
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> >>
> >>
> >
> >
> >
> >
> 
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