<snip>

>One more question of mine regarding the STD in Fig. 12 >is why do we have a
>loop back (shown by green colour) to the success state >with event 'INVITE'
>and message sent '2XX'. I thought that 2XX is ONLY >retransmitted according
>to the timers rule (T1, T2) which is already accounted >for by the loop
>back to the success state (shown by black colour) and >not due to the
>reception of duplicate INVITE request?

If a late INVITE arrives, the flow shown in green proceeds. All responses are 
retransmitted on arrival of a duplicate INVITE.

Regards,
Deepak

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