[SIPForum-discussion] Query for Time T4

Sumeet Bhardwaj sumeet_bhardwaj at persistent.co.in
Tue Jan 12 07:21:36 UTC 2010


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.


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

Small correction it will be 481 and not 408.
And yes after transaction reaches terminated state and retransmission for that transaction will receive 481.

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<mailto:lakhan.p at gmail.com>, lakhan.p at hotmail.com<mailto:lakhan.p at hotmail.com>
IBM India Private Ltd. Bangalore
Contact: +91-9902791177

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