[SIPForum-discussion] Query for Time T4

srinivas.banda at wipro.com srinivas.banda at wipro.com
Tue Jan 19 12:32:11 UTC 2010

Hi All,
I don't think so you will get 481 message for the re-transmited ACK,
because the side B doesn't match the the ACK with existing
dialog/transaction it has to ignore the ACK. Because side A doesn't
expect any response to ACK message. Only INVITE/OPTIONS/UPDATE/BYE/INFO
methods will expects a response.
ACK never expects the response.


From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Vijay Tiwari
Sent: Saturday, January 09, 2010 4:16 PM
To: lakhan patel
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Query for Time T4

Hello Lakhan
it can not be 408. it should be 481 Call leg does not exist and if its
reply 481 Call leg does not exist then its okay. 
And in  sip response: number have signification not words. if i config
like that 

200 failed "it means call success not failed." 


On Fri, Jan 8, 2010 at 11:13 AM, lakhan patel <lakhan.p at gmail.com>

	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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They can because they think they can.

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