[SIPForum-discussion] Choosing the best response. Clarification needed

[trungdo]

HI,

You can change the invite time out waiting less then 32 seconds. This case
is use when have 2 UAS, the UAC send first register invite to active server
before time out. After that the UAC send to second Server.

What is the UAC are u using ? That's VIP gateway or softphone. ?


Regards

trungDo

On 5/13/09 7:22 PM, "Yevgen Krapiva" <ykrapiva at gmail.com> wrote:

> Yes.
> 
>> then proxy sends final response when all transaction end.
> 
> It will happen when Timer D fires.
> 
>> so an absolute minimum of 32s is used instead of basing Timer D on T1.
> 
> Am I (UAC) supposed to wait 32 seconds before I get an answer from
> proxy that my request failed ? It's too long. O_o
> I'm saying that proxy must not wait when client transaction finally go
> to terminated state. I think that COMPLETED state already gives me a
> right to send the final response to UAC. Why not ?
> 
> 
> 
> 2009/5/13, Tomasz Zieleniewski <tzieleniewski at gmail.com>:
>> Hi,
>> 
>> I think You have mistaken the completed with terminated state.
>> When proxy receives 300-699 response this causes a proxy client transaction
>> to
>> transition to completed state. In which for unreliable transport it starts
>> D
>> timer
>> in order to generate ACK for transaction response retransmissions.
>> When D timer fires transaction transitions to completed state. (proxy
>> removes any associated resources)
>> Keep in mind that this a per transaction behavior. When there is forking at
>> the proxy
>> if the response is not 6xx or 200 then proxy sends final response when all
>> transaction end.
>> 
>> Kind regards,
>> - Tomasz Zieleniewski
>> 
>> 2009/5/12 Yevgen Krapiva <ykrapiva at gmail.com>
>> 
>>> Hi.
>>> 
>>> Here is a quote from RFC 3261 Response processing section in statefull
>>> proxies:
>>> 
>>>> 6.  Choosing the best response
>>>> 
>>>>         A stateful proxy MUST send a final response to a response
>>>>         context's server transaction if no final responses have been
>>>>         immediately forwarded by the above rules and all client
>>>>         transactions in this response context have been terminated.
>>> 
>>> Should I treat the words "terminated transaction" as transaction in
>>> TERMINATED state ? If yes, then keeping in mind that client
>>> transactions created by proxy "live" for about 30 seconds in case of
>>> 3XX-699 responses, then the UAC have to wait half a minute until the
>>> proxy answers him.
>>> 
>>> In other words: If client transaction created by proxy receives
>>> 3XX-699 response, then it will elapse 30 seconds before transaction
>>> goes from COMPLETED to TERMINATED state. All this time proxy have to
>>> wait until it sends the final response to UAC.
>>> 
>>> Is it normal ? Or should proxy choose the best response when all
>>> client transactions goes to COMPLETED OR TERMINATED state ?
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>> 
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