This test was on OpenPBX: ./sipp -i 192.168.12.147 -sn uac 192.168.12.116 -s 1234 -d 100 -l 90 -r 5 -m 1000 Call limit reached (-m 1000), 0.973 s period 2 ms scheduler resolution 0 concurrent calls (limit 90) Peak was 90 calls, after 22 s 4133 out-of-call msg (discarded) 1 open sockets Messages Retrans Timeout Unexpected-Msg INVITE ----------> 1000 4124 263 100 <---------- 744 0 0 180 <---------- 0 0 0 183 <---------- 0 0 0 200 <---------- E-RTD 737 2576 0 ACK ----------> 737 2576 Var Pause [ 100ms] 737 0 BYE ----------> 737 3899 88 200 <---------- 649 0 0 ------------------------------ Test Terminated -------------------------------- ----------------------------- Statistics Screen ------- [1-5]: Change Screen -- Start Time | 2006-12-18 15:42:13 Last Reset Time | 2006-12-18 15:48:02 Current Time | 2006-12-18 15:48:03 -------------------------+---------------------------+-------------------------- Counter Name | Periodic value | Cumulative value -------------------------+---------------------------+-------------------------- Elapsed Time | 00:00:00:973 | 00:05:50:170 Call Rate | 0.000 cps | 2.856 cps -------------------------+---------------------------+-------------------------- Incoming call created | 0 | 0 OutGoing call created | 0 | 1000 Total Call created | | 1000 Current Call | 0 | -------------------------+---------------------------+-------------------------- Successful call | 0 | 649 Failed call | 2 | 351 -------------------------+---------------------------+-------------------------- Response Time | 00:00:00:000 | 00:00:11:646 Call Length | 00:00:31:819 | 00:00:28:303 ------------------------------ Test Terminated -------------------------------- ********************************************************************************************************************** This one was on Asterisk: mesquita:/usr/src/sipp-1.1rc6# ./sipp -i 192.168.12.147 -sn uac ideafix.lightcomm.com.br -s 1234 -d 100 -l 90 -r 5 -m 1000 Resolving remote host 'ideafix.lightcomm.com.br'... Done. ------------------------------ Scenario Screen -------- [1-5]: Change Screen -- Call-rate(length) Port Total-time Total-calls Remote-host 5.0(100 ms)/1.000s 5060 200.16 s 1000 192.168.5.116:5060(UDP) Call limit reached (-m 1000), 0.947 s period 2 ms scheduler resolution 0 concurrent calls (limit 90) Peak was 2 calls, after 0 s 5782 out-of-call msg (discarded) 1 open sockets Messages Retrans Timeout Unexpected-Msg INVITE ----------> 1000 1 0 100 <---------- 999 0 0 180 <---------- 0 0 0 183 <---------- 0 0 0 200 <---------- E-RTD 1000 0 0 ACK ----------> 1000 0 Var Pause [ 100ms] 1000 0 BYE ----------> 1000 0 0 200 <---------- 1000 0 0 ------------------------------ Test Terminated -------------------------------- ----------------------------- Statistics Screen ------- [1-5]: Change Screen -- Start Time | 2006-12-18 15:38:43 Last Reset Time | 2006-12-18 15:42:02 Current Time | 2006-12-18 15:42:03 -------------------------+---------------------------+-------------------------- Counter Name | Periodic value | Cumulative value -------------------------+---------------------------+-------------------------- Elapsed Time | 00:00:00:947 | 00:03:20:170 Call Rate | 4.224 cps | 4.996 cps -------------------------+---------------------------+-------------------------- Incoming call created | 0 | 0 OutGoing call created | 4 | 1000 Total Call created | | 1000 Current Call | 0 | -------------------------+---------------------------+-------------------------- Successful call | 5 | 1000 Failed call | 0 | 0 -------------------------+---------------------------+-------------------------- Response Time | 00:00:00:027 | 00:00:00:030 Call Length | 00:00:00:158 | 00:00:00:232 ------------------------------ Test Terminated -------------------------------- 2006-12-18 15:42:03: Discarding message which can't be mapped to a known SIPp call: CANCEL :1234@192.168.5.116:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.5.116:5060;branch=z9hG4bK11f758fd;rport From: sut To: sipp ;tag=920 Contact: Call-ID: 920-6737@192.168.12.147 CSeq: 101 CANCEL User-Agent: PABX Lightcomm Max-Forwards: 70 Content-Length: 0 . sipp: There were more errors, enable -trace_err to log them.