[SIPForum-discussion] Query for Time T4

[Nitin Kapoor]

Sumeet,

If it is not necessary, then could you please let me know what could be the
expected  behavior/mesage in that scenario.

Thanks,
Nitin Kapoor



2010/1/12 Sumeet Bhardwaj <sumeet_bhardwaj at persistent.co.in>

>  Hello,
>
>
>
> It doesn’t necessary that it will receive 481 for that. ACK is to
> acknowledge the response and if it receives ACK after moving to terminated
> state, it should ignore the ACK. Sending 481 for that ACK will be
> unnecessary response for that ACK. 481 is generally use to send when
> matching transaction is not found for termination.
>
>
>
> Thanks
>
> -Sumeet
>
>
>
> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org] *On Behalf Of *sunilkumar.verma at wipro.com
> *Sent:* Tuesday, January 12, 2010 9:33 AM
> *To:* lakhan.p at gmail.com; discussion at sipforum.org
> *Subject:* Re: [SIPForum-discussion] Query for Time T4
>
>
>
> Hi,
>
> Small correction it will be 481 and not 408.
>
> And yes after transaction reaches terminated state and retransmission for
> that transaction will receive 481.
>
>
>
> Regards
>
> Sunil Verma
>
>
>  ------------------------------
>
> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org] *On Behalf Of *lakhan patel
> *Sent:* Friday, January 08, 2010 11:14 AM
> *To:* discussion at sipforum.org
> *Subject:* [SIPForum-discussion] Query for Time T4
>
>
>
> Hi All,
>
> I have doubt about T4 Timer and what happen if any dialog is in terminated
> state and other side tries to communicate with previous dialog which was
> terminated?
>
> After INVTE from A to B, B sends *404 Not found* and B received *ACk *for
> *404* but when A-side receive *404 *and send *ACK *for *404 *Call goes in
> *Confirm* state and after *5second(T4 timer fires) *it goes under *Terminated
> *state and after that if we are sending Re-send *ACK *for *404 *it should
> reply with *408 Call leg does not exist*.
>
> *Can Any body tell me is it correct call flow or not?*
>
>
>
>
> --
> Thanks & Regards
> Shivlakhan Patel
> Email: lakhan.p at gmail.com, lakhan.p at hotmail.com
> IBM India Private Ltd. Bangalore
> Contact: +91-9902791177
>
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