[SIPForum-discussion] Query for Time T4

lakhan patel lakhan.p at gmail.com
Fri Jan 8 05:43:43 UTC 2010

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

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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