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

Tomasz Zieleniewski tzieleniewski at gmail.com
Wed May 13 12:09:58 UTC 2009


I think You have mistaken the completed with terminated state.
When proxy receives 300-699 response this causes a proxy client transaction
transition to completed state. In which for unreliable transport it starts D
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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