New subject: [Serusers] Re: Xten-RTPProxy choppy audio

10 Dec 2003

Hi Adrian!

Does your media proxy also forward RTCP packets?

Klaus

...
  -----Original Message-----
 From: Adrian Georgescu [mailto:ag@ag-projects.com] 
 Sent: Wednesday, December 10, 2003 5:44 PM
 To: Ricardo Villa
 Cc: serusers(a)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" &lt;darilion(a)ict.tuwien.ac.at&gt;
 To: "Jan Janak" &lt;janak(a)fokus.fraunhofer.de&gt;de>; "Adrian
Georgescu"
 &lt;ag(a)ag-projects.com&gt;
 Cc: &lt;serusers(a)lists.iptel.org&gt;rg>; "Ricardo Villa"
&lt;ricvil(a)epm.net.co&gt;
 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@fokus.fraunhofer.de]
> Sent: Wednesday, December 10, 2003 4:09 PM
> To: Adrian Georgescu
> Cc: serusers(a)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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