11 Dec
2003
11 Dec
'03
3:03 a.m.
Hi Maxim,
I just tried it the and choppy audio has dissapered. An Ethereal trace
shows that the "ICMP Destination Unreachable" is no longer sent back and the
Xten client is no longer restarting the RTP Media Streams. My question is:
is your fix supposed to send the RTCP packet to the other end
(Xten->RTP->ATA186)? I ask because I could not see this packet being
forwarded to the ATA186 on my trace. In any case it is working great!
Thanks,
Ricardo
----- Original Message -----
From: "Maxim Sobolev" <sobomax(a)portaone.com>
To: "Klaus Darilion" <darilion(a)ict.tuwien.ac.at>
Cc: "Jan Janak" <janak(a)fokus.fraunhofer.de>de>;
<serusers(a)lists.iptel.org>rg>; "Adrian
Georgescu" <ag(a)ag-projects.com>om>; "Ricardo Villa"
<ricvil(a)epm.net.co>
Sent: Wednesday, December 10, 2003 7:32 PM
Subject: [Serusers] Patch for RTPProxy (original C version) to support RTCP
I've crafted patch to support RTCP in addition to
RTP, please test and
let me know if it works or not. This should solve the problem with X-Lite.
http://www.portaone.com/~sobomax/rtpproxy.rtcp.diff
Thanks!
-Maxim
Klaus Darilion wrote:
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?
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-----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:
>
>
>>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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>
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>
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