root@comcerto:~# tcpdump -i any port 5060 -vvv tcpdump: listening on any, link-type LINUX_SLL (Linux cooked v1), capture size 262144 bytes 0 packets captured 0 packets received by filter 0 packets dropped by kernel root@comcerto:~# tcpdump -i any port 5060 or port 6060 -vvv tcpdump: listening on any, link-type LINUX_SLL (Linux cooked v1), capture size 262144 bytes 07:02:26.697956 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 1000) 192.168.20.145.5060 > 192.168.20.144.5060: [udp sum ok] SIP, length: 972 INVITE sip:22@192.168.20.144:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK2731092598 From: "11" ;tag=4044204411 To: Call-ID: 0_2164660753@192.168.20.145 CSeq: 1 INVITE Contact: Content-Type: application/sdp Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE Max-Forwards: 70 User-Agent: Yealink SIP-T21P_E2 52.82.14.1 Supported: timer Session-Expires: 300;refresher=uac Min-SE: 90 Allow-Events: talk,hold,conference,refer,check-sync Supported: replaces Content-Length: 310 v=0 o=- 20010 20010 IN IP4 192.168.20.145 s=SDP data c=IN IP4 192.168.20.145 t=0 0 m=audio 11858 RTP/AVP 9 0 8 18 101 a=rtpmap:9 G722/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=ptime:20 a=sendrecv a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 07:02:26.709735 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 470) 192.168.20.144.5060 > 192.168.20.145.5060: [udp sum ok] SIP, length: 442 SIP/2.0 407 Proxy Authentication Required Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK2731092598 Proxy-Authenticate: Digest nonce="1757574146:ff779fcf0b64c423be90f18088293368",algorithm=MD5,realm="192.168.20.144",qop="auth,auth-int" To: ;tag=9e3d852b From: "11";tag=4044204411 Call-ID: 0_2164660753@192.168.20.145 CSeq: 1 INVITE Server: repro 1.12.0 Content-Length: 0 07:02:26.713959 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 306) 192.168.20.145.5060 > 192.168.20.144.5060: [udp sum ok] SIP, length: 278 ACK sip:22@192.168.20.144:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK2731092598 From: "11" ;tag=4044204411 To: ;tag=9e3d852b Call-ID: 0_2164660753@192.168.20.145 CSeq: 1 ACK Content-Length: 0 07:02:26.721978 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 1256) 192.168.20.145.5060 > 192.168.20.144.5060: [udp sum ok] SIP, length: 1228 INVITE sip:22@192.168.20.144:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK3538034718 From: "11" ;tag=4044204411 To: Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 INVITE Contact: Proxy-Authorization: Digest username="11", realm="192.168.20.144", nonce="1757574146:ff779fcf0b64c423be90f18088293368", uri="sip:22@192.168.20.144:5060", response="893dcadb9670385eca766d86cb545283", algorithm=MD5, cnonce="0a4f113b", qop=auth, nc=00000001 Content-Type: application/sdp Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE Max-Forwards: 70 User-Agent: Yealink SIP-T21P_E2 52.82.14.1 Supported: timer Session-Expires: 300;refresher=uac Min-SE: 90 Allow-Events: talk,hold,conference,refer,check-sync Supported: replaces Content-Length: 310 v=0 o=- 20010 20010 IN IP4 192.168.20.145 s=SDP data c=IN IP4 192.168.20.145 t=0 0 m=audio 11858 RTP/AVP 9 0 8 18 101 a=rtpmap:9 G722/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=ptime:20 a=sendrecv a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 07:02:26.749420 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 1141) localhost..5060 > localhost..6060: [bad udp cksum 0x0275 -> 0x6c61!] SIP, length: 1113 INVITE sip:22@127.0.0.1:6060;transport=udp SIP/2.0 Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---9b2d62604ef0e34c;rport Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK3538034718 Max-Forwards: 69 Record-Route: Contact: To: From: "11";tag=4044204411 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 INVITE Session-Expires: 300;refresher=uac Min-SE: 90 Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE Content-Type: application/sdp Supported: timer, replaces User-Agent: Yealink SIP-T21P_E2 52.82.14.1 Allow-Events: talk, hold, conference, refer, check-sync Content-Length: 310 v=0 o=- 20010 20010 IN IP4 192.168.20.145 s=SDP data c=IN IP4 192.168.20.145 t=0 0 m=audio 11858 RTP/AVP 9 0 8 18 101 a=rtpmap:9 G722/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=ptime:20 a=sendrecv a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 07:02:26.761244 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 389) localhost..6060 > localhost..5060: [bad udp cksum 0xff84 -> 0x5326!] SIP, length: 361 SIP/2.0 100 Trying Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---9b2d62604ef0e34c;rport=5060 Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK3538034718 From: "11" ;tag=4044204411 To: Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 INVITE User-Agent: eXosip/5.3.0 Content-Length: 0 07:02:26.800284 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 681) localhost..6060 > localhost..5060: [bad udp cksum 0x00a9 -> 0x1edf!] SIP, length: 653 SIP/2.0 180 Ringing Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---9b2d62604ef0e34c;rport=5060 Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK3538034718 Record-Route: From: "11" ;tag=4044204411 To: ;tag=461241907 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 INVITE Contact: Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,REFER,NOTIFY,INFO,UPDATE,PRACK,SUBSCRIBE User-Agent: eXosip/5.3.0 Allow-Events: conference Supported: replaces,timer,100rel P-Asserted-Identity: Content-Length: 0 07:02:26.815191 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 276) 192.168.20.144.5060 > 192.168.20.145.5060: [udp sum ok] SIP, length: 248 SIP/2.0 100 Trying Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK3538034718 To: From: "11" ;tag=4044204411 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 INVITE Content-Length: 0 07:02:26.815587 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 628) 192.168.20.144.5060 > 192.168.20.145.5060: [udp sum ok] SIP, length: 600 SIP/2.0 180 Ringing Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK3538034718 Record-Route: Contact: To: ;tag=461241907 From: "11" ;tag=4044204411 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 INVITE Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, REFER, NOTIFY, INFO, UPDATE, PRACK, SUBSCRIBE Server: repro 1.12.0 Supported: replaces, timer, 100rel User-Agent: eXosip/5.3.0 Allow-Events: conference P-Asserted-Identity: Content-Length: 0 07:02:30.167088 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 991) localhost..6060 > localhost..5060: [bad udp cksum 0x01df -> 0x51fa!] SIP, length: 963 SIP/2.0 200 OK Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---9b2d62604ef0e34c;rport=5060 Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK3538034718 Record-Route: From: "11" ;tag=4044204411 To: ;tag=461241907 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 INVITE Contact: Content-Type: application/sdp Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,REFER,NOTIFY,INFO,UPDATE,PRACK,SUBSCRIBE Session-expires: 300;refresher=uac User-Agent: eXosip/5.3.0 Allow-Events: conference Supported: replaces,timer,100rel X-Endpoint-Type: FS01 P-Asserted-Identity: Require: timer Content-Length: 205 v=0 o=gateway 0 0 IN IP4 192.168.20.144 s=conversation c=IN IP4 192.168.20.144 t=0 0 m=audio 10508 RTP/AVP 9 101 a=rtpmap:9 G722/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv 07:02:30.178693 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 936) 192.168.20.144.5060 > 192.168.20.145.5060: [udp sum ok] SIP, length: 908 SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK3538034718 Record-Route: Require: timer Contact: To: ;tag=461241907 From: "11" ;tag=4044204411 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 INVITE Session-Expires: 300;refresher=uac Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, REFER, NOTIFY, INFO, UPDATE, PRACK, SUBSCRIBE Content-Type: application/sdp Server: repro 1.12.0 Supported: replaces, timer, 100rel User-Agent: eXosip/5.3.0 Allow-Events: conference P-Asserted-Identity: X-Endpoint-Type: FS01 Content-Length: 205 v=0 o=gateway 0 0 IN IP4 192.168.20.144 s=conversation c=IN IP4 192.168.20.144 t=0 0 m=audio 10508 RTP/AVP 9 101 a=rtpmap:9 G722/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv 07:02:30.192697 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 710) 192.168.20.145.5060 > 192.168.20.144.5060: [udp sum ok] SIP, length: 682 ACK sip:22@127.0.0.1:6060 SIP/2.0 Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK2189259537 Route: From: "11" ;tag=4044204411 To: ;tag=461241907 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 ACK Contact: Proxy-Authorization: Digest username="11", realm="192.168.20.144", nonce="1757574146:ff779fcf0b64c423be90f18088293368", uri="sip:22@192.168.20.144:5060", response="893dcadb9670385eca766d86cb545283", algorithm=MD5, cnonce="0a4f113b", qop=auth, nc=00000001 Max-Forwards: 70 User-Agent: Yealink SIP-T21P_E2 52.82.14.1 Content-Length: 0 07:02:30.203258 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 741) localhost..5060 > localhost..6060: [bad udp cksum 0x00e5 -> 0x9e14!] SIP, length: 713 ACK sip:22@127.0.0.1:6060 SIP/2.0 Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---f3e4b60bb123a848;rport Via: SIP/2.0/UDP 192.168.20.145:5060;branch=z9hG4bK2189259537 Max-Forwards: 69 Contact: To: ;tag=461241907 From: "11" ;tag=4044204411 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 ACK Proxy-Authorization: Digest username="11", realm="192.168.20.144", nonce="1757574146:ff779fcf0b64c423be90f18088293368", uri="sip:22@192.168.20.144:5060", response="893dcadb9670385eca766d86cb545283", algorithm=MD5, cnonce="0a4f113b", qop=auth, nc=00000001 User-Agent: Yealink SIP-T21P_E2 52.82.14.1 Content-Length: 0 07:02:31.056619 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 32) 192.168.20.145.5060 > 192.168.20.144.5060: [udp sum ok] SIP 07:02:40.515591 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 403) localhost..6060 > localhost..5060: [bad udp cksum 0xff92 -> 0xc4d3!] SIP, length: 375 BYE sip:11@192.168.20.145:5060 SIP/2.0 Via: SIP/2.0/UDP 127.0.0.1:6060;rport;branch=z9hG4bK1825194370 Route: From: ;tag=461241907 To: "11" ;tag=4044204411 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 BYE Max-Forwards: 70 User-Agent: eXosip/5.3.0 Content-Length: 0 07:02:40.537870 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 444) 192.168.20.144.5060 > 192.168.20.145.5060: [udp sum ok] SIP, length: 416 BYE sip:11@192.168.20.145:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.20.144:5060;branch=z9hG4bK-524287-1---4104311d73a79631;rport Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK1825194370 Max-Forwards: 69 To: "11" ;tag=4044204411 From: ;tag=461241907 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 BYE User-Agent: eXosip/5.3.0 Content-Length: 0 07:02:40.543685 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 425) 192.168.20.145.5060 > 192.168.20.144.5060: [udp sum ok] SIP, length: 397 SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.20.144:5060;branch=z9hG4bK-524287-1---4104311d73a79631;rport=5060 Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK1825194370 From: ;tag=461241907 To: "11" ;tag=4044204411 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 BYE User-Agent: Yealink SIP-T21P_E2 52.82.14.1 Content-Length: 0 07:02:40.553795 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 355) localhost..5060 > localhost..6060: [bad udp cksum 0xff62 -> 0x5a1c!] SIP, length: 327 SIP/2.0 200 OK Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK1825194370 To: "11" ;tag=4044204411 From: ;tag=461241907 Call-ID: 0_2164660753@192.168.20.145 CSeq: 2 BYE Server: repro 1.12.0 User-Agent: Yealink SIP-T21P_E2 52.82.14.1 Content-Length: 0 18 packets captured 25 packets received by filter 0 packets dropped by kernel root@comcerto:~#