[Serusers] Re: Xten-RTPProxy choppy audio

[Ricardo Villa]

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
> >
> > _______________________________________________
> > Serusers mailing list
> > serusers at lists.iptel.org
> > http://lists.iptel.org/mailman/listinfo/serusers
>
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