11 -> 2*

root@comcerto:~# tcpdump -vvv -i any port 5060
tcpdump: listening on any, link-type LINUX_SLL (Linux cooked v1), capture size 262144 bytes
06:17:56.366099 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 1288)
    localhost..6060 > localhost..5060: [bad udp cksum 0x0308 -> 0xa7fc!] SIP, length: 1260
        INVITE sip:2*@192.168.20.104 SIP/2.0
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport;branch=z9hG4bK313590094
        From: <sip:11@192.168.20.104>;tag=1420045302
        To: <sip:2*@192.168.20.104>
        Call-ID: 2121056236
        CSeq: 20 INVITE
        Contact: <sip:11@127.0.0.1:6060>
        Content-Type: application/sdp
        Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,REFER,NOTIFY,INFO,UPDATE,PRACK,SUBSCRIBE
        Max-Forwards: 70
        User-Agent: eXosip/5.3.0
        X-Endpoint-Type: FXS
        Allow-Events: conference
        Supported: replaces,timer,100rel
        Content-Length:   751

        v=0
        o=gateway 0 4 IN IP4 192.168.20.104
        s=conversation
        c=IN IP4 192.168.20.104
        t=0 0
        m=audio 10002 RTP/SAVP 8 0 4 18 101 13 98
        a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:fWi7GvqWluIv6eFEvuxMPo6sxbhBbVdXeB6d7/zw
        a=crypto:2 AES_CM_128_HMAC_SHA1_32 inline:Vyo8l54oj+CXMh5Mdi4tFq904nPkVrfOU83uIYoe
        a=rtpmap:8 PCMA/8000
        a=rtpmap:0 PCMU/8000
        a=rtpmap:4 G723/8000
        a=rtpmap:18 G729/8000
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-15
        a=rtpmap:13 CN/8000
        a=rtpmap:98 PCMA/8000
        a=gpmd:98 vbd=yes
        m=audio 10002 RTP/AVP 8 0 4 18 101 13 98
        a=rtpmap:8 PCMA/8000
        a=rtpmap:0 PCMU/8000
        a=rtpmap:4 G723/8000
        a=rtpmap:18 G729/8000
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-15
        a=rtpmap:13 CN/8000
        a=rtpmap:98 PCMA/8000
        a=gpmd:98 vbd=yes
06:17:56.387562 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 1448)
    192.168.20.104.5060 > 192.168.20.104.5060: [bad udp cksum 0xafc6 -> 0x1076!] SIP, length: 1420
        INVITE sip:22@192.168.20.104 SIP/2.0
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        Max-Forwards: 69
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Contact: <sip:11@127.0.0.1:6060>
        To: <sip:2*@192.168.20.104>
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 INVITE
        Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, REFER, NOTIFY, INFO, UPDATE, PRACK, SUBSCRIBE
        Content-Type: application/sdp
        Supported: replaces, timer, 100rel
        User-Agent: eXosip/5.3.0
        Allow-Events: conference
        X-Endpoint-Type: FXS
        Content-Length: 751

        v=0
        o=gateway 0 4 IN IP4 192.168.20.104
        s=conversation
        c=IN IP4 192.168.20.104
        t=0 0
        m=audio 10002 RTP/SAVP 8 0 4 18 101 13 98
        a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:fWi7GvqWluIv6eFEvuxMPo6sxbhBbVdXeB6d7/zw
        a=crypto:2 AES_CM_128_HMAC_SHA1_32 inline:Vyo8l54oj+CXMh5Mdi4tFq904nPkVrfOU83uIYoe
        a=rtpmap:8 PCMA/8000
        a=rtpmap:0 PCMU/8000
        a=rtpmap:4 G723/8000
        a=rtpmap:18 G729/8000
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-15
        a=rtpmap:13 CN/8000
        a=rtpmap:98 PCMA/8000
        a=gpmd:98 vbd=yes
        m=audio 10002 RTP/AVP 8 0 4 18 101 13 98
        a=rtpmap:8 PCMA/8000
        a=rtpmap:0 PCMU/8000
        a=rtpmap:4 G723/8000
        a=rtpmap:18 G729/8000
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-15
        a=rtpmap:13 CN/8000
        a=rtpmap:98 PCMA/8000
        a=gpmd:98 vbd=yes
06:17:56.412529 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 1607)
    localhost..5060 > localhost..6060: [bad udp cksum 0x0447 -> 0x65cf!] SIP, length: 1579
        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---382f6b4c263cf55d;rport
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport=5060
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        Max-Forwards: 68
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Contact: <sip:11@127.0.0.1:6060>
        To: <sip:2*@192.168.20.104>
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 INVITE
        Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, REFER, NOTIFY, INFO, UPDATE, PRACK, SUBSCRIBE
        Content-Type: application/sdp
        Supported: replaces, timer, 100rel
        User-Agent: eXosip/5.3.0
        Allow-Events: conference
        X-Endpoint-Type: FXS
        Content-Length: 751

        v=0
        o=gateway 0 4 IN IP4 192.168.20.104
        s=conversation
        c=IN IP4 192.168.20.104
        t=0 0
        m=audio 10002 RTP/SAVP 8 0 4 18 101 13 98
        a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:fWi7GvqWluIv6eFEvuxMPo6sxbhBbVdXeB6d7/zw
        a=crypto:2 AES_CM_128_HMAC_SHA1_32 inline:Vyo8l54oj+CXMh5Mdi4tFq904nPkVrfOU83uIYoe
        a=rtpmap:8 PCMA/8000
        a=rtpmap:0 PCMU/8000
        a=rtpmap:4 G723/8000
        a=rtpmap:18 G729/8000
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-15
        a=rtpmap:13 CN/8000
        a=rtpmap:98 PCMA/8000
        a=gpmd:98 vbd=yes
        m=audio 10002 RTP/AVP 8 0 4 18 101 13 98
        a=rtpmap:8 PCMA/8000
        a=rtpmap:0 PCMU/8000
        a=rtpmap:4 G723/8000
        a=rtpmap:18 G729/8000
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-15
        a=rtpmap:13 CN/8000
        a=rtpmap:98 PCMA/8000
        a=gpmd:98 vbd=yes
06:17:56.420531 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 455)
    localhost..6060 > localhost..5060: [bad udp cksum 0xffc6 -> 0xea18!] SIP, length: 427
        SIP/2.0 100 Trying
        Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---382f6b4c263cf55d;rport=5060
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport=5060
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        From: <sip:11@192.168.20.104>;tag=1420045302
        To: <sip:2*@192.168.20.104>
        Call-ID: 2121056236
        CSeq: 20 INVITE
        User-Agent: eXosip/5.3.0
        Content-Length: 0

06:17:56.458539 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 833)
    localhost..6060 > localhost..5060: [bad udp cksum 0x0141 -> 0xf1ac!] SIP, length: 805
        SIP/2.0 180 Ringing
        Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---382f6b4c263cf55d;rport=5060
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport=5060
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        From: <sip:11@192.168.20.104>;tag=1420045302
        To: <sip:2*@192.168.20.104>;tag=161636353
        Call-ID: 2121056236
        CSeq: 20 INVITE
        Contact: <sip:2*@127.0.0.1:6060>
        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: <sip:22@192.168.20.104>
        Require: 100rel
        RSeq: 100
        Content-Length: 0

06:17:56.460407 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 250)
    localhost..5060 > localhost..6060: [bad udp cksum 0xfef9 -> 0xf616!] SIP, length: 222
        SIP/2.0 100 Trying
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        To: <sip:2*@192.168.20.104>
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 INVITE
        Content-Length: 0

06:17:56.471557 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 758)
    192.168.20.104.5060 > 192.168.20.104.5060: [bad udp cksum 0xad14 -> 0xed80!] SIP, length: 730
        SIP/2.0 180 Ringing
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport=5060
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Require: 100rel
        Contact: <sip:2*@127.0.0.1:6060>
        To: <sip:2*@192.168.20.104>;tag=161636353
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 INVITE
        Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, REFER, NOTIFY, INFO, UPDATE, PRACK, SUBSCRIBE
        Supported: replaces, timer, 100rel
        User-Agent: eXosip/5.3.0
        Allow-Events: conference
        RSeq: 100
        P-Asserted-Identity: <sip:22@192.168.20.104>
        Content-Length: 0

06:17:56.485077 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 666)
    localhost..5060 > localhost..6060: [bad udp cksum 0x009a -> 0x41ca!] SIP, length: 638
        SIP/2.0 180 Ringing
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Record-Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Require: 100rel
        Contact: <sip:2*@127.0.0.1:6060>
        To: <sip:2*@192.168.20.104>;tag=161636353
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 INVITE
        Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, REFER, NOTIFY, INFO, UPDATE, PRACK, SUBSCRIBE
        Supported: replaces, timer, 100rel
        User-Agent: eXosip/5.3.0
        Allow-Events: conference
        RSeq: 100
        P-Asserted-Identity: <sip:22@192.168.20.104>
        Content-Length: 0

06:17:56.495837 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 477)
    localhost..6060 > localhost..5060: [bad udp cksum 0xffdc -> 0xfac0!] SIP, length: 449
        PRACK sip:2*@127.0.0.1:6060 SIP/2.0
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport;branch=z9hG4bK1620608770
        Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Route: <sip:192.168.20.104:5060;transport=udp;lr>
        From: <sip:11@192.168.20.104>;tag=1420045302
        To: <sip:2*@192.168.20.104>;tag=161636353
        Call-ID: 2121056236
        CSeq: 21 PRACK
        Contact: <sip:11@127.0.0.1:6060>
        Max-Forwards: 70
        User-Agent: eXosip/5.3.0
        RAck: 100 20 INVITE
        Content-Length: 0

06:17:56.508822 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 518)
    192.168.20.104.5060 > 192.168.20.104.5060: [bad udp cksum 0xac24 -> 0x8ed4!] SIP, length: 490
        PRACK sip:2*@127.0.0.1:6060 SIP/2.0
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---c7d61f4ffcf6d15c;rport
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK1620608770
        Max-Forwards: 69
        Route: <sip:192.168.20.104:5060;transport=udp;lr>
        Contact: <sip:11@127.0.0.1:6060>
        To: <sip:2*@192.168.20.104>;tag=161636353
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 21 PRACK
        User-Agent: eXosip/5.3.0
        RAck: 100 20 INVITE
        Content-Length: 0

06:17:56.519716 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 554)
    localhost..5060 > localhost..6060: [bad udp cksum 0x002a -> 0xdea4!] SIP, length: 526
        PRACK sip:2*@127.0.0.1:6060 SIP/2.0
        Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---b809a61422e4dc3c;rport
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---c7d61f4ffcf6d15c;rport=5060
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK1620608770
        Max-Forwards: 68
        Contact: <sip:11@127.0.0.1:6060>
        To: <sip:2*@192.168.20.104>;tag=161636353
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 21 PRACK
        User-Agent: eXosip/5.3.0
        RAck: 100 20 INVITE
        Content-Length: 0


06:18:05.745442 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 307)
    localhost..6060 > localhost..5060: [bad udp cksum 0xff32 -> 0xcc40!] SIP, length: 279
        CANCEL sip:2*@192.168.20.104 SIP/2.0
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport;branch=z9hG4bK313590094
        From: <sip:11@192.168.20.104>;tag=1420045302
        To: <sip:2*@192.168.20.104>
        Call-ID: 2121056236
        CSeq: 20 CANCEL
        Max-Forwards: 70
        User-Agent: eXosip/5.3.0
        Content-Length: 0

06:18:05.757995 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 259)
    localhost..5060 > localhost..6060: [bad udp cksum 0xff02 -> 0xa41c!] SIP, length: 231
        SIP/2.0 200 OK
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        To: <sip:2*@192.168.20.104>;tag=dde1e54c
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 CANCEL
        Content-Length: 0

06:18:05.758420 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 305)
    192.168.20.104.5060 > 192.168.20.104.5060: [bad udp cksum 0xab4f -> 0x3b6d!] SIP, length: 277
        CANCEL sip:22@192.168.20.104 SIP/2.0
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport
        Max-Forwards: 70
        To: <sip:2*@192.168.20.104>
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 CANCEL
        Content-Length: 0

06:18:05.771958 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 283)
    192.168.20.104.5060 > 192.168.20.104.5060: [bad udp cksum 0xab39 -> 0xee01!] SIP, length: 255
        SIP/2.0 200 OK
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport=5060
        To: <sip:2*@192.168.20.104>;tag=509ec444
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 CANCEL
        Content-Length: 0

06:18:05.772423 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 314)
    localhost..5060 > localhost..6060: [bad udp cksum 0xff39 -> 0x60ce!] SIP, length: 286
        CANCEL 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---382f6b4c263cf55d;rport
        Max-Forwards: 70
        To: <sip:2*@192.168.20.104>
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 CANCEL
        Content-Length: 0

06:18:05.787996 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 305)
    localhost..6060 > localhost..5060: [bad udp cksum 0xff30 -> 0xb4bb!] SIP, length: 277
        SIP/2.0 200 OK
        Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---382f6b4c263cf55d;rport=5060
        From: <sip:11@192.168.20.104>;tag=1420045302
        To: <sip:2*@192.168.20.104>;tag=161636353
        Call-ID: 2121056236
        CSeq: 20 CANCEL
        User-Agent: eXosip/5.3.0
        Content-Length: 0

06:18:05.795634 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 481)
    localhost..6060 > localhost..5060: [bad udp cksum 0xffe0 -> 0xd5bf!] SIP, length: 453
        SIP/2.0 487 Request Terminated
        Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK-524287-1---382f6b4c263cf55d;rport=5060
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport=5060
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        From: <sip:11@192.168.20.104>;tag=1420045302
        To: <sip:2*@192.168.20.104>;tag=161636353
        Call-ID: 2121056236
        CSeq: 20 INVITE
        User-Agent: eXosip/5.3.0
        Content-Length: 0

06:18:05.806396 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 322)
    localhost..5060 > localhost..6060: [bad udp cksum 0xff41 -> 0x9ca8!] SIP, length: 294
        ACK 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---382f6b4c263cf55d;rport
        Max-Forwards: 70
        To: <sip:2*@192.168.20.104>;tag=161636353
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 ACK
        Content-Length: 0

06:18:05.812110 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 394)
    192.168.20.104.5060 > 192.168.20.104.5060: [bad udp cksum 0xaba8 -> 0xb846!] SIP, length: 366
        SIP/2.0 487 Request Terminated
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport=5060
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        To: <sip:2*@192.168.20.104>;tag=161636353
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 INVITE
        User-Agent: eXosip/5.3.0
        Content-Length: 0

06:18:05.822580 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 313)
    192.168.20.104.5060 > 192.168.20.104.5060: [bad udp cksum 0xab57 -> 0x3b83!] SIP, length: 285
        ACK sip:22@192.168.20.104 SIP/2.0
        Via: SIP/2.0/UDP 192.168.20.104:5060;branch=z9hG4bK-524287-1---1161f126e1d21659;rport
        Max-Forwards: 70
        To: <sip:2*@192.168.20.104>;tag=161636353
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 ACK
        Content-Length: 0

06:18:05.828466 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 302)
    localhost..5060 > localhost..6060: [bad udp cksum 0xff2d -> 0xbbe0!] SIP, length: 274
        SIP/2.0 487 Request Terminated
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport=6060;branch=z9hG4bK313590094
        To: <sip:2*@192.168.20.104>;tag=161636353
        From: <sip:11@192.168.20.104>;tag=1420045302
        Call-ID: 2121056236
        CSeq: 20 INVITE
        User-Agent: eXosip/5.3.0
        Content-Length: 0

06:18:05.844934 IP (tos 0x68, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 271)
    localhost..6060 > localhost..5060: [bad udp cksum 0xff0e -> 0x3a88!] SIP, length: 243
        ACK sip:2*@192.168.20.104 SIP/2.0
        Via: SIP/2.0/UDP 127.0.0.1:6060;rport;branch=z9hG4bK313590094
        From: <sip:11@192.168.20.104>;tag=1420045302
        To: <sip:2*@192.168.20.104>;tag=161636353
        Call-ID: 2121056236
        CSeq: 20 ACK
        Content-Length: 0


23 packets captured
53 packets received by filter
5 packets dropped by kernel