Hi, I am doing load testing with of Kamailio. I have sipp (version 3.3) as the load generator,Kamailio(4.2.7) as Load Balancer and Freeswitch (1.6.5) as Gateways. I am using the following command to generate load ./sipp -sf uac.xml -d 2000 -m 4000 -l 1000 -r 200 -trace_stat -i SIPP_IP -p 15060 --trace_err -trace_error_codes -trace_calldebug -trace_screen KAM_IP When the rate of generation is below 80 (-r 80), Kamailio behaves fine.But if we go beyond 80, Kamailio starts sending "500 Service Unavailable" 2016-01-12 11:18:15.375103 1452577695.375103: Aborting call on unexpected message for Call-Id '96-32493@SIPP_IP': while expecting '180' (index 2), received 'SIP/2.0 500 Service Unavailable^M Via: SIP/2.0/UDP SIPP_IP:15060;branch=z9hG4bK-32493-96-0^M From: sipp <sip:sipp@SIPP_IP:15060>;tag=96^M To: sut <sip:service@KAM_IP:5060>;tag=55f576f507e822fa6633cf4bc22740e6-6660^M Call-ID: 96-32493@SIPP_IP^M CSeq: 1 INVITE^M Server: kamailio (4.2.7 (x86_64/linux))^M Content-Length: 0^M With the above command, sipp output is ----------------------------- Statistics Screen ------- [1-9]: Change Screen -- Start Time | 2016-01-12 11:26:07.723764 1452578167.723764 Last Reset Time | 2016-01-12 11:27:16.280901 1452578236.280901 Current Time | 2016-01-12 11:27:16.282737 1452578236.282737 -------------------------+---------------------------+-------------------------- Counter Name | Periodic value | Cumulative value -------------------------+---------------------------+-------------------------- Elapsed Time | 00:00:00:001000 | 00:01:08:558000 Call Rate | 0.000 cps | 58.345 cps -------------------------+---------------------------+-------------------------- Incoming call created | 0 | 0 OutGoing call created | 0 | 4000 Total Call created | | 4000 Current Call | 0 | -------------------------+---------------------------+-------------------------- Successful call | 0 | 1192 Failed call | 0 | 2808 -------------------------+---------------------------+-------------------------- Response Time 1 | 00:00:00:000000 | 00:00:15:102000 Call Length | 00:00:00:000000 | 00:00:10:614000 ------------------------------ Test Terminated -------------------------------- Kamailio is run with command /usr/local/sbin/kamailio -f /usr/local/etc/kamailio/kamailio.cfg -P /var/run/kamailio/kamailio.pid -m 512 -M 8 -u kamailio -g kamailio version: kamailio 4.2.7 (x86_64/linux) 727746 flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, DBG_QM_MALLOC, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: 727746 compiled on 15:59:03 Jan 11 2016 with gcc 4.6.3 System : Ubuntu 12.04.4 LTS Linux devops10-60-20-169 3.11.0-15-generic #25~precise1-Ubuntu SMP Thu Jan 30 17:39:31 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux I am not seeing any errors in Kamailio Logs. Any pointers on how to get it to serve more calls/sec Regards, Sandeep The most profound statements are often said in silence. -Lynn Johnston _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users