[Serusers] Re: Xten-RTPProxy choppy audio

[Klaus Darilion]

Short summary:

Maxim's rtpproxy and x-light causes problems as x-light sends RTCP
messages which will result in ICMP error messages as rtpproxy doesn't
support RTCP. This causes x-light to create a new RTP session (new ssrc,
seq-nr) and produces choppy sound.

Solutions:
1. use Adrians RTP proxy as it supports RTCP
2. extend Maxims rtpproxy to support RTCP

3. THE EASIEST SOLUTION: Update X-light to version build 1095. This
version ignores ICMP errors and works fine (on my PC)!

regards,
Klaus

PS: nevertheless build 1095 (as 1088) is IMO buggy as it doesn't
register to my default proxy, but to all other configured proxies. Any
solutions?

> -----Original Message-----
> From: Maxim Sobolev [mailto:sobomax at portaone.com] 
> Sent: Wednesday, December 10, 2003 5:56 PM
> To: Ricardo Villa
> Cc: Klaus Darilion; Jan Janak; Adrian Georgescu; serusers at lists.iptel.org
> Subject: Re: [Serusers] Re: Xten-RTPProxy choppy audio
> 
> 
> Ok, I see, probably it tries to send a RTCP packet, which is OK by 
> itself, but handles resulting ICMP in a strange way. I'll extend RTP 
> proxy to make it relaying RTCP traffic as well (I am having 
> it on a TODO 
> list for a quite some time now), which should fix this problem.
> 
> Thank you for the debugging!
> 
> In the meantime, disabling RTCP in X-Ten should solve the problem.
> 
> -Maxim
> 
> 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
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> >>
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> >>
> >>
> > 
> > 
> > 
> > 
> > 
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