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

10 Dec 2003

Sending to rtp port +1 is ok, that is RTCP. the RTCP port is defined as
rtp+1. better would be if the RTP proxy would also forward RTCP,
nevertheless x-lite should also handle clients which do not support RTCP
(and answers with ICMP errors).

Klaus

...
  -----Original Message-----
 From: Ricardo Villa [mailto:ricvil@epm.net.co] 
 Sent: Wednesday, December 10, 2003 5:41 PM
 To: Klaus Darilion; Jan Janak; Adrian Georgescu
 Cc: serusers(a)lists.iptel.org
 Subject: Re: [Serusers] Re: Xten-RTPProxy choppy audio

 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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