root@comcerto:~# tcpdump -v -s1514 port 5060 and host 172.16.200.70
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 1514 bytes
04:37:46.042690 IP (tos 0xa,ECT(0), ttl 61, id 32165, offset 0, flags [DF], proto UDP (17), length 372)
    172.16.200.70.5060 > 172.16.110.11.5060: SIP, length: 344
        OPTIONS sip:172.16.110.11:5060 SIP/2.0
        Via: SIP/2.0/UDP 172.16.200.70:5060;branch=z9hG4bK_a3Kr_1763094650839X0006D56E
        To: <sip:172.16.110.11:5060>
        From: <sip:172.16.200.70:5060>;tag=1763094650000764B2
        Contact: <sip:172.16.200.70:5060>
        Call-ID: 6916B07ACCE0E0006D468_172.16.200.70
        CSeq: 100 OPTIONS
        Max-Forwards: 70
        Content-Length: 0

04:37:46.054527 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 343)
    172.16.110.11.5060 > 172.16.200.70.5060: SIP, length: 315
        SIP/2.0 200 OK
        Via: SIP/2.0/UDP 172.16.200.70:5060;branch=z9hG4bK_a3Kr_1763094650839X0006D56E
        Contact: <sip:172.16.110.11:5060>
        To: <sip:172.16.110.11:5060>;tag=9148de3b
        From: <sip:172.16.200.70:5060>;tag=1763094650000764B2
        Call-ID: 6916B07ACCE0E0006D468_172.16.200.70
        CSeq: 100 OPTIONS
        Content-Length: 0

04:37:47.263918 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 1265)
    172.16.110.11.5060 > 172.16.200.70.5060: SIP, length: 1237
        INVITE sip:36901@172.16.200.70:5060;user=phone SIP/2.0
        Via: SIP/2.0/UDP 172.16.110.11:5060;branch=z9hG4bK-524287-1---d3ca871b30386064;rport
        Via: SIP/2.0/UDP 172.16.100.70:5060;branch=z9hG4bK-t8dy9-xwifp
        Max-Forwards: 69
        Record-Route: <sip:172.16.110.11:5060;transport=udp;lr>
04:37:47.268802 IP (tos 0xa,ECT(0), ttl 61, id 32343, offset 0, flags [DF], proto UDP (17), length 554)
    172.16.200.70.5060 > 172.16.110.11.5060: SIP, length: 526
        SIP/2.0 100 Trying
        Via: SIP/2.0/UDP 172.16.110.11:5060;received=172.16.110.11;branch=z9hG4bK-524287-1---d3ca871b30386064;rport=5060
        Via: SIP/2.0/UDP 172.16.100.70:5060;branch=z9hG4bK-t8dy9-xwifp
        Record-Route: <sip:172.16.110.11:5060;transport=udp;lr>
        To: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
        From: <sip:31189@172.16.100.70:5060;user=phone;cpc=ordinary>;tag=74fn44keqh
        Contact: <sip:36901@172.16.200.70:5060>
        Call-ID: ff46ca58ayt3eyh8npg@172.16.100.70
        CSeq: 189 INVITE
        Content-Length: 0

04:37:47.423803 IP (tos 0xa,ECT(0), ttl 61, id 32345, offset 0, flags [DF], proto UDP (17), length 845)
    172.16.200.70.5060 > 172.16.110.11.5060: SIP, length: 817
        SIP/2.0 180 Ringing
        Via: SIP/2.0/UDP 172.16.110.11:5060;received=172.16.110.11;branch=z9hG4bK-524287-1---d3ca871b30386064;rport=5060
        Via: SIP/2.0/UDP 172.16.100.70:5060;branch=z9hG4bK-t8dy9-xwifp
        Record-Route: <sip:172.16.110.11:5060;transport=udp;lr>
        To: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
        From: <sip:31189@172.16.100.70:5060;user=phone;cpc=ordinary>;tag=74fn44keqh
        Contact: <sip:36901@172.16.200.70:5060>
        Call-ID: ff46ca58ayt3eyh8npg@172.16.100.70
        CSeq: 189 INVITE
        Allow: INVITE,CANCEL,ACK,BYE,INFO,PRACK,UPDATE,NOTIFY,MESSAGE,REFER,OPTIONS
        Session-ID: c35208d08a9b4ead8058fbe8e3230c0f
        Content-Type: application/sdp
        Content-Length: 134

        v=0
        o=mkd 1763094525 1 IN IP4 172.16.200.70
        s=protei
        c=IN IP4 172.16.200.70
        t=0 0
        m=audio 21548 RTP/AVP 8
        a=rtpmap:8 PCMA/8000
04:37:50.161107 IP (tos 0xa,ECT(0), ttl 61, id 32803, offset 0, flags [DF], proto UDP (17), length 840)
    172.16.200.70.5060 > 172.16.110.11.5060: SIP, length: 812
        SIP/2.0 200 OK
        Via: SIP/2.0/UDP 172.16.110.11:5060;received=172.16.110.11;branch=z9hG4bK-524287-1---d3ca871b30386064;rport=5060
        Via: SIP/2.0/UDP 172.16.100.70:5060;branch=z9hG4bK-t8dy9-xwifp
        Record-Route: <sip:172.16.110.11:5060;transport=udp;lr>
        To: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
        From: <sip:31189@172.16.100.70:5060;user=phone;cpc=ordinary>;tag=74fn44keqh
        Contact: <sip:36901@172.16.200.70:5060>
        Call-ID: ff46ca58ayt3eyh8npg@172.16.100.70
        CSeq: 189 INVITE
        Allow: INVITE,CANCEL,ACK,BYE,INFO,PRACK,UPDATE,NOTIFY,MESSAGE,REFER,OPTIONS
        Session-ID: c35208d08a9b4ead8058fbe8e3230c0f
        Content-Type: application/sdp
        Content-Length: 134

        v=0
        o=mkd 1763094525 1 IN IP4 172.16.200.70
        s=protei
        c=IN IP4 172.16.200.70
        t=0 0
        m=audio 21548 RTP/AVP 8
        a=rtpmap:8 PCMA/8000
04:37:50.188243 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 516)
    172.16.110.11.5060 > 172.16.200.70.5060: SIP, length: 488
        ACK sip:36901@172.16.200.70:5060 SIP/2.0
        Via: SIP/2.0/UDP 172.16.110.11:5060;branch=z9hG4bK-524287-1---09d2b77f8d3d781d;rport
        Via: SIP/2.0/UDP 172.16.100.70:5060;branch=z9hG4bK-qe79s-1uyc7
        Max-Forwards: 69
        To: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
04:37:50.191107 IP (tos 0xa,ECT(0), ttl 61, id 32810, offset 0, flags [DF], proto UDP (17), length 828)
    172.16.200.70.5060 > 172.16.110.11.5060: SIP, length: 800
        INVITE sip:31189@172.16.100.70:5060;user=phone SIP/2.0
        Via: SIP/2.0/UDP 172.16.200.70:5060;branch=z9hG4bK_a3Kr_1763094654987X0006D572
        Route: <sip:172.16.110.11:5060;transport=udp;lr>
        To: <sip:31189@172.16.100.70:5060;user=phone;cpc=ordinary>;tag=74fn44keqh
        From: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
        Contact: <sip:36901@172.16.200.70:5060>
        Call-ID: ff46ca58ayt3eyh8npg@172.16.100.70
        CSeq: 1000 INVITE
        Max-Forwards: 70
        Allow: INVITE,CANCEL,ACK,BYE,INFO,PRACK,UPDATE,NOTIFY,MESSAGE,REFER,OPTIONS
        Content-Type: application/sdp
        Content-Length: 214

        v=0
        o=mkd 1763094525 2 IN IP4 172.29.100.21
        s=protei
        c=IN IP4 172.29.100.21
        t=0 0
        m=audio 12428 RTP/AVP 8 101
        a=rtpmap:8 PCMA/8000
        a=ptime:20
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-15
        a=sendrecv
04:37:50.207223 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 540)
    172.16.110.11.5060 > 172.16.200.70.5060: SIP, length: 512
        SIP/2.0 407 Proxy Authentication Required
        Via: SIP/2.0/UDP 172.16.200.70:5060;branch=z9hG4bK_a3Kr_1763094654987X0006D572
        Proxy-Authenticate: Digest nonce="1763095070:7476a641db183155682c4364acc5d0dd",algorithm=MD5,realm="172.16.110.11",qop="auth,auth-int"
        To: <sip:31189@172.16.100.70:5060;user=phone;cpc=ordinary>;tag=74fn44keqh
        From: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
        Call-ID: ff46ca58ayt3eyh8npg@172.16.100.70
        CSeq: 1000 INVITE
        Server: repro 1.12.0
        Content-Length: 0

04:37:50.211122 IP (tos 0xa,ECT(0), ttl 61, id 32812, offset 0, flags [DF], proto UDP (17), length 407)
    172.16.200.70.5060 > 172.16.110.11.5060: SIP, length: 379
        ACK sip:31189@172.16.100.70:5060;user=phone SIP/2.0
        Via: SIP/2.0/UDP 172.16.200.70:5060;branch=z9hG4bK_a3Kr_1763094654987X0006D572
        To: <sip:31189@172.16.100.70:5060;user=phone;cpc=ordinary>;tag=74fn44keqh
        From: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
        Call-ID: ff46ca58ayt3eyh8npg@172.16.100.70
        CSeq: 1000 ACK
        Max-Forwards: 70
        Content-Length: 0

04:37:50.212178 IP (tos 0xa,ECT(0), ttl 61, id 32813, offset 0, flags [DF], proto UDP (17), length 481)
    172.16.200.70.5060 > 172.16.110.11.5060: SIP, length: 453
        BYE sip:31189@172.16.100.70:5060;user=phone SIP/2.0
        Via: SIP/2.0/UDP 172.16.200.70:5060;branch=z9hG4bK_a3Kr_1763094655008X0006D573
        Route: <sip:172.16.110.11:5060;transport=udp;lr>
        To: <sip:31189@172.16.100.70:5060;user=phone;cpc=ordinary>;tag=74fn44keqh
        From: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
        Call-ID: ff46ca58ayt3eyh8npg@172.16.100.70
        CSeq: 1001 BYE
        Max-Forwards: 70
        Reason: Q.850;cause=34
        Content-Length: 0

04:37:50.243631 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 374)
    172.16.110.11.5060 > 172.16.200.70.5060: SIP, length: 346
        SIP/2.0 200 OK
        Via: SIP/2.0/UDP 172.16.200.70:5060;branch=z9hG4bK_a3Kr_1763094655008X0006D573
        To: <sip:31189@172.16.100.70:5060;user=phone;cpc=ordinary>;tag=74fn44keqh
        From: <sip:36901@172.16.110.11:5060;user=phone>;tag=1763094652000764B3
        Call-ID: ff46ca58ayt3eyh8npg@172.16.100.70
        CSeq: 1001 BYE
        Server: repro 1.12.0
        Content-Length: 0


12 packets captured
13 packets received by filter
0 packets dropped by kernel
root@comcerto:~#

