10 Dec
2003
10 Dec
'03
7:22 p.m.
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@portaone.com]
Sent: Wednesday, December 10, 2003 5:56 PM
To: Ricardo Villa
Cc: Klaus Darilion; Jan Janak; Adrian Georgescu; serusers(a)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(a)ict.tuwien.ac.at>
To: "Jan Janak" <janak(a)fokus.fraunhofer.de>de>; "Adrian
Georgescu"
<ag(a)ag-projects.com>
Cc: <serusers(a)lists.iptel.org>rg>; "Ricardo Villa"
<ricvil(a)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@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:
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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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