[Devel] ask invite/cancel race condition issue again

[Bogdan-Andrei Iancu]

Hi Di-Shi,

yes, there is a solution for this - at the beginning of the script use 
t_check_tran() to see if the CANCEL does match an INVITE request. IF no, 
just silently discard it - this will force the UAC to retransmit the 
CANCEL until the proxy actually finished processing the INVITE (and 
build transaction for it).

BTW, fo you have any input for bug 1592883 ?

regards,
bogdan

Di-Shi Sun wrote:
> Hi All,
>  
> I met the INVITE/CANCEL race condition that had been disscussed long 
> ago in this maillist. The formal script of this issue like this:
>  
> *the CANCEL arrives BEFORE the INVITE, or
> *it arrives after but you are doing other high-cost processing steps (i.e., DNS lookup (ENUM)) before calling t_relay which will lead to process the CANCEL before creating the transaction.
>  
> It said that this issue had been fixed. But I cannot find the solution. Could anyone give me some suggestion?
>  
> Thanks,
>  
> Di-Shi Sun.
>  
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