[Serusers] Re: Patch for RTPProxy (original C version) to support RTCP

[Adrian Georgescu]

I can confirm that Maxim's patched RTPProxy works flawlessly with Xten 
client now. So a little bit of competition did not hurt.

Regards,
Adrian

On Thursday, Dec 11, 2003, at 01:32 Europe/Amsterdam, Maxim Sobolev 
wrote:

> 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
>>>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
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