[Kamailio-Users] Dealing with REGISTER "retransmissions"

[Klaus Darilion]

try this one:
http://www.kamailio.org/docs/modules/devel/htable.html#id2454064


mayamatakeshi schrieb:
> Hello,
> we are running kamailio 1.4.
> Some days ago one of our subscribers SIP phone went crazy and
> bombarded our proxy with thousands of REGISTER requests. Actually, it
> didn't wait for any response of the proxy, it just kept sending
> REGISTER messages (same packet always). Since we are running with
> nonce_reuse disabled, it stalled the server due to "auth:challenge:
> failed to generate nonce".
> I don't have the whole figure but the packet capture I inspected
> showed that the terminal sent more than 200 thousand REGISTER messages
> in 15 seconds.
> We may not be able to replace those terminals at this moment. So to
> avoid this problem to happen again, we enabled nonce_reuse. However
> this only will solve the nonce problem but still we will have a lot of
> hits to database.
> So I was thinking, maybe I should create a transaction before sending
> the challenge so that REGISTER retransmissions would be absorbed. I
> was thinking in doing something like this:
> 
> 	if (!proxy_authorize("", "subscriber")) {
>                 t_newtran();
> 		proxy_challenge("", "0");
> 		exit;
> 	}
> 
> Does anyone see any problem/shortcoming with this?
> 
> regards,
> takeshi
> 
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