Re: [Kamailio-Users] Dealing with REGISTER "retransmissions"

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 _______________________________________________ Kamailio (OpenSER) - Users mailing list Users(a)lists.kamailio.org http://lists.kamailio.org/cgi-bin/mailman/listinfo/users http://lists.openser-project.org/cgi-bin/mailman/listinfo/users