[Devel] unmatched cancel again

[Bogdan-Andrei Iancu]

Hi Juha,

you can do this right now from the script - use the t_check_trans() 
function :
    http://www.openser.org/docs/modules/0.10.x/tm.html#AEN475
if the CANCEL does not match, just exit from script.

regards,
bogdan

Juha Heinanen wrote:

>it occurred to me that my earlier proposal on creating an invite
>transaction for an unmatched cancel is not a good idea, because it would
>open yet another opportunity for DoS attacks.  neither is any solution
>that would occupy proxy's transaction resources.
>
>in my opinion, the best solution is again the simplest one: silently
>discard any unmatched cancels.
>
>if the cancel was for real, but invite got delayed or lost, cancel will
>be resend by the UAC and no harm was done by discarding the first
>cancel.
>
>even if you decide to implement something more complex, i would very
>much appreciate a tm configuration variable
>
>discard_unmatched_cancels
>
>which, if set, would cause the above simple behavior.
>
>-- juha
>
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