[Serusers] ATA support for RTCP

Thu Dec 11 10:07:43 CET 2003

This has nothing to do with the fix. Because ATA does not send RTPC 
when it starts the call, the proxy does not know where to relay it as 
the NAT firewall did not open any port for that.

Regards,
Adrian

On Thursday, Dec 11, 2003, at 02:03 Europe/Amsterdam, Ricardo Villa 
wrote:

> 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 at portaone.com>
> To: "Klaus Darilion" <darilion at ict.tuwien.ac.at>
> Cc: "Jan Janak" <janak at fokus.fraunhofer.de>; <serusers at lists.iptel.org>; 
> "Adrian
> Georgescu" <ag at ag-projects.com>; "Ricardo Villa" <ricvil at 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?
>>>
>>>
>>>> -----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
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Serusers mailing list
>>>>>>> serusers at lists.iptel.org
>>>>>>> http://lists.iptel.org/mailman/listinfo/serusers
>>>>>>
>>>>>> _______________________________________________
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>>>>>> http://lists.iptel.org/mailman/listinfo/serusers
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> serusers at lists.iptel.org
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>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
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>>
>
>
>
>
Adrian Georgescu
AG Projects
ag at ag-projects.com
www.ag-projects.com
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