Hi, I am using kamailio 1.4.2 and testing it with sipp. one sipp is client a uac (port 5066), the other is a uas (port 5063). kamailio is using 5060.
I am generating 100 calls per second for 1000 calls and message were retransmitted 4 times.
Here is a tcpdump of sip packets. Can anyone tell me why there is an INVITE retransmission at 16:16:38.627198 though the ACK for invite was received at 16:16:38.126096 ? Is there a known problem with retransmission timers ?
16:16:38.120384 IP 192.168.168.33.5066 > 192.168.168.33.5060: SIP, length: 579 E.._..@.@.f....!...!.....K..INVITE sip:otest@testg5 SIP/2.0 Via: SIP/2.0/UDP 127.0.0.1:5066;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 70 Expires: 180 Subject: Performance Test Content-Type: application/sdp Content-Length: 188
v=0 o=user1 53655765 2353687637 IN IP4 127.0.0.1 s=- c=IN IP4 127.0.0.1 t=0 0 m=audio 8925 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-11,16
16:16:38.123426 IP 192.168.168.33.5060 > 192.168.168.33.5066: SIP, length: 325 E..a..@.@.g....!...!.....M..SIP/2.0 100 Giving a try Via: SIP/2.0/UDP 127.0.0.1:5066;branch=z9hG4bK-23096-730-1;received=192.168.168.33 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Server: Kamailio (1.4.2-notls (i386/linux)) Content-Length: 0
16:16:38.123554 IP 192.168.168.33.5060 > 192.168.168.33.5063: SIP, length: 731 E.....@.@.fZ...!...!........INVITE sip:otest@testg5 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.0 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Expires: 180 Subject: Performance Test Content-Type: application/sdp Content-Length: 188
v=0 o=user1 53655765 2353687637 IN IP4 127.0.0.1 s=- c=IN IP4 127.0.0.1 t=0 0 m=audio 8925 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-11,16
16:16:38.123830 IP 192.168.168.33.5063 > 192.168.168.33.5060: SIP, length: 451 E.....@.@.gz...!...!.......pSIP/2.0 180 Ringing Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.0, SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:38.124169 IP 192.168.168.33.5060 > 192.168.168.33.5066: SIP, length: 393 E.....@.@.g....!...!.......6SIP/2.0 180 Ringing Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:38.124326 IP 192.168.168.33.5063 > 192.168.168.33.5060: SIP, length: 634 E.....@.@.f....!...!.......'SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.0, SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Contact: sip:127.0.0.1:5063 Content-Type: application/sdp Content-Length: 153
v=0 o=user1 53655765 2353687637 IN IP4 127.0.0.1 s=- c=IN IP4 127.0.0.1 t=0 0 m=audio 6004 RTP/AVP 0 8 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000
16:16:38.124883 IP 192.168.168.33.5060 > 192.168.168.33.5066: SIP, length: 581 E..a..@.@.f....!...!.....M..SIP/2.0 200 OK Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Contact: sip:192.168.168.33:5063 Content-Type: application/sdp Content-Length: 153
v=0 o=user1 53655765 2353687637 IN IP4 127.0.0.1 s=- c=IN IP4 127.0.0.1 t=0 0 m=audio 6004 RTP/AVP 0 8 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000
16:16:38.125532 IP 192.168.168.33.5066 > 192.168.168.33.5060: SIP, length: 427 E.....@.@.g....!...!.......XACK sip:192.168.168.33:5063 SIP/2.0 Via: SIP/2.0/UDP 127.0.0.1:5066;branch=z9hG4bK-23096-730-11 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696 Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 70 Subject: Performance Test Content-Length: 0
16:16:38.126096 IP 192.168.168.33.5060 > 192.168.168.33.5063: SIP, length: 521 E..%..@.@.g,...!...!........ACK sip:192.168.168.33:5063 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.2 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-11 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Subject: Performance Test Content-Length: 0
16:16:38.627198 IP 192.168.168.33.5060 > 192.168.168.33.5063: SIP, length: 731 E.....@.@.fZ...!...!........INVITE sip:otest@testg5 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.0 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Expires: 180 Subject: Performance Test Content-Type: application/sdp Content-Length: 188
v=0 o=user1 53655765 2353687637 IN IP4 127.0.0.1 s=- c=IN IP4 127.0.0.1 t=0 0 m=audio 8925 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-11,16
16:16:38.627677 IP 192.168.168.33.5063 > 192.168.168.33.5060: SIP, length: 474 E.....@.@.gc...!...!........SIP/2.0 180 Ringing Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.2, SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-11 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:38.627970 IP 192.168.168.33.5060 > 192.168.168.33.5066: SIP, length: 416 E.....@.@.g....!...!.......MSIP/2.0 180 Ringing Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-11 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:39.642356 IP 192.168.168.33.5060 > 192.168.168.33.5063: SIP, length: 731 E.....@.@.fZ...!...!........INVITE sip:otest@testg5 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.0 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Expires: 180 Subject: Performance Test Content-Type: application/sdp Content-Length: 188
v=0 o=user1 53655765 2353687637 IN IP4 127.0.0.1 s=- c=IN IP4 127.0.0.1 t=0 0 m=audio 8925 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-11,16
16:16:39.642587 IP 192.168.168.33.5063 > 192.168.168.33.5060: SIP, length: 474 E.....@.@.gc...!...!........SIP/2.0 180 Ringing Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.2, SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-11 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:39.643723 IP 192.168.168.33.5060 > 192.168.168.33.5066: SIP, length: 416 E.....@.@.g....!...!.......MSIP/2.0 180 Ringing Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-11 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5;tag=17278SIPpTag01696;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:39.797641 IP 192.168.168.33.5066 > 192.168.168.33.5060: SIP, length: 434 E.....@.@.g....!...!......._BYE sip:127.0.0.1:5063 SIP/2.0 Via: SIP/2.0/UDP 127.0.0.1:5066;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 70 Subject: Performance Test Content-Length: 0
16:16:39.798436 IP 192.168.168.33.5060 > 127.0.0.1.5063: SIP, length: 528 E..,..@.@.P....!............BYE sip:127.0.0.1:5063 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bK9b7d.0423bf25.0 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Subject: Performance Test Content-Length: 0
16:16:39.798535 IP 192.168.168.33.5063 > 192.168.168.33.5060: SIP, length: 394 E.....@.@.g....!...!.......7SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bK9b7d.0423bf25.0, SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:39.798814 IP 192.168.168.33.5060 > 192.168.168.33.5066: SIP, length: 336 E..l..@.@.g....!...!.....X..SIP/2.0 200 OK Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:40.257973 IP 192.168.168.33.5060 > 127.0.0.1.5063: SIP, length: 528 E..,..@.@.P....!............BYE sip:127.0.0.1:5063 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bK9b7d.0423bf25.0 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Subject: Performance Test Content-Length: 0
16:16:40.258080 IP 192.168.168.33.5063 > 192.168.168.33.5060: SIP, length: 394 E.....@.@.g....!...!.......7SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bK9b7d.0423bf25.0, SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:41.285493 IP 192.168.168.33.5060 > 127.0.0.1.5063: SIP, length: 528 E..,..@.@.P....!............BYE sip:127.0.0.1:5063 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bK9b7d.0423bf25.0 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Subject: Performance Test Content-Length: 0
16:16:41.285593 IP 192.168.168.33.5063 > 192.168.168.33.5060: SIP, length: 394 E.....@.@.g....!...!.......7SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bK9b7d.0423bf25.0, SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:127.0.0.1:5063 Content-Length: 0
16:16:41.695686 IP 192.168.168.33.5060 > 192.168.168.33.5063: SIP, length: 731 E.....@.@.fZ...!...!........INVITE sip:otest@testg5 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bKcb7d.7c08af34.0 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-1 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:otest@testg5 Call-ID: 730-23096-127.0.0.1 CSeq: 1 INVITE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Expires: 180 Subject: Performance Test Content-Type: application/sdp Content-Length: 188
v=0 o=user1 53655765 2353687637 IN IP4 127.0.0.1 s=- c=IN IP4 127.0.0.1 t=0 0 m=audio 8925 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-11,16
16:16:43.338592 IP 192.168.168.33.5060 > 127.0.0.1.5063: SIP, length: 528 E..,..@.@.P....!............BYE sip:127.0.0.1:5063 SIP/2.0 Record-Route: sip:192.168.168.33;lr=on;ftag=23096SIPpTag09730 Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bK9b7d.0423bf25.0 Via: SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:sipp@127.0.0.1:5066 Max-Forwards: 69 Subject: Performance Test Content-Length: 0
16:16:43.338785 IP 192.168.168.33.5063 > 192.168.168.33.5060: SIP, length: 408 E.....@.@.g....!...!.......ESIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.168.33;branch=z9hG4bK9b7d.0423bf25.0, SIP/2.0/UDP 127.0.0.1:5066;received=192.168.168.33;branch=z9hG4bK-23096-730-46 From: sipp sip:730-23096-127.0.0.1@127.0.0.1:5066;tag=23096SIPpTag09730 To: sut sip:service@192.168.168.33:5060;tag=17278SIPpTag01696 Call-ID: 730-23096-127.0.0.1 CSeq: 2 BYE Contact: sip:127.0.0.1:5063;transport=UDP Content-Length: 0