[OpenSER-Users] best response seems wrong.

Bogdan-Andrei Iancu bogdan at voice-system.ro
Wed Jan 16 16:27:57 CET 2008


I agree - the branch 0 is missing (only 1 and 2 show up in the trace), 
so it must be on the lo.....

regards,
bogdan

Klaus Darilion wrote:
> I guess somehow the message gets looped to the proxy again:
>
> Take a look at the topmost Via header of the relayed PUBLISH. At the 
> end you see .1 and .2. This measn the .1 branch and the .2 branch. 
> Where is the .0 branch?
>
> I guess it is lopped back to openser (via loopback interface) and is 
> rejected with 407.
>
> Try "ngrep -d any" or "tcpdump -i any" to see loopback too!
>
> regards
> klaus
>
> Aymeric Moizard schrieb:
>>
>>
>>
>> On Wed, 16 Jan 2008, Bogdan-Andrei Iancu wrote:
>>
>>> Hi Aymeric,
>>>
>>> could you describe the message flow (requests and replies)? I 
>>> understand you do parallel forking to 2 clients that return 5xx 
>>> replies, but where the 407 comes from??
>>
>> I was about to send the capture:
>>
>> http://antisip.antisip.com/publish-issue.pcap
>>
>> Put the filter "sip contains 77622" to view the incoming
>> transaction + the 2 outgoing transactions. 2 501 are received
>> and one 407 is sent back. There is no incoming 407 that comes
>> to openser.
>>
>> I have to admit that the call flow is strange, because my openser 
>> forwards the PUBLISH sent by a user to himself. (I don't have 
>> presence server) The second strange thing is that the same softphone 
>> is registred twice on the same IP... However, this demonstrates the 
>> issue.
>>
>> In case, there is only ONE binding for the user, the 501 is forwarded 
>> correctly...
>>
>> To reproduce the error:
>> My softphone:
>> http://sip.antisip.com/download/emansip-setup/emansip-setup-v411-rc10.exe 
>>
>> Create an account first on:
>> http://sip.antisip.com/
>>
>> I'm currently modifying my softphone to send 405, hoping that will fix
>> the issue... However, it would still be nice to solve it.
>>
>> tks for your effort,
>> Aymeric
>>
>>> regards,
>>> bogdan
>>>
>>> Iñaki Baz Castillo wrote:
>>>> On Wednesday 16 January 2008 14:58:22 Aymeric Moizard wrote:
>>>>
>>>>> (sorry: just repost to follow correct thread/subjet)
>>>>>
>>>>> I just found another  example from rfc3261 where an endpoint will 
>>>>> use 5xx
>>>>> class answer:
>>>>>
>>>>> 12.2.2 UAS Behavior
>>>>>
>>>>> Page 76:
>>>>>
>>>>>     If the remote sequence number is empty, it MUST be set to the 
>>>>> value
>>>>>     of the sequence number in the CSeq header field value in the 
>>>>> request.
>>>>>     If the remote sequence number was not empty, but the sequence 
>>>>> number
>>>>>     of the request is lower than the remote sequence number, the 
>>>>> request
>>>>>     is out of order and MUST be rejected with a 500 (Server Internal
>>>>>     Error) response.
>>>>>
>>>>> Hope I convinced you!
>>>>>
>>>>
>>>> Yes ;)
>>>>
>>>>
>>>> So the question here is why OpenSer is replying 407. But it's so 
>>>> strange...
>>>>
>>>>
>>>
>>>
>





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