From Nathan Leyton, 6 Years ago, written in Plain Text.
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  1.  INVITE sip:5000@voip.callhandling.co.uk;transport=UDP SIP/2.0
  2.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---85bfa7c0af3fabcb;rport
  3.    Max-Forwards: 70
  4.    Contact: <sip:1002@178.78.120.2:14314;transport=UDP>
  5.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>
  6.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  7.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  8.    CSeq: 1 INVITE
  9.    Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE
  10.    Content-Type: application/sdp
  11.    User-Agent: Zoiper rd82a609
  12.    Allow-Events: presence, kpml, talk
  13.    Content-Length: 212
  14.    
  15.    v=0
  16.    o=Zoiper 0 0 IN IP4 10.0.0.69
  17.    s=Zoiper
  18.    c=IN IP4 10.0.0.69
  19.    t=0 0
  20.    m=audio 35812 RTP/AVP 0 8 101
  21.    a=rtpmap:0 PCMU/8000
  22.    a=rtpmap:8 PCMA/8000
  23.    a=rtpmap:101 telephone-event/8000
  24.    a=fmtp:101 0-16
  25.    a=sendrecv
  26.  
  27.  
  28.  
  29.    SIP/2.0 100 Trying
  30.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---85bfa7c0af3fabcb;rport=44612
  31.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  32.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>
  33.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  34.    CSeq: 1 INVITE
  35.    User-Agent: FreeSWITCH-mod_sofia/1.6.17-34-0fc0946~64bit
  36.    Content-Length: 0
  37.  
  38.  
  39.  
  40.  
  41.    SIP/2.0 407 Proxy Authentication Required
  42.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---85bfa7c0af3fabcb;rport=44612
  43.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  44.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>;tag=aHKX9vy4g53Sg
  45.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  46.    CSeq: 1 INVITE
  47.    User-Agent: FreeSWITCH-mod_sofia/1.6.17-34-0fc0946~64bit
  48.    Accept: application/sdp
  49.    Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
  50.    Supported: timer, path, replaces
  51.    Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
  52.    Proxy-Authenticate: Digest realm="voip.callhandling.co.uk", nonce="bf7f11bc-e8e0-4a03-9b5d-3f87fc3a4c8d", algorithm=MD5, qop="auth"
  53.    Content-Length: 0
  54.    
  55.    
  56.    
  57.    
  58.  
  59.  ACK sip:5000@voip.callhandling.co.uk;transport=UDP SIP/2.0
  60.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---85bfa7c0af3fabcb;rport
  61.    Max-Forwards: 70
  62.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>;tag=aHKX9vy4g53Sg
  63.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  64.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  65.    CSeq: 1 ACK
  66.    Content-Length: 0
  67.  
  68.  
  69.  INVITE sip:5000@voip.callhandling.co.uk;transport=UDP SIP/2.0
  70.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---facebbbb04b4deae;rport
  71.    Max-Forwards: 70
  72.    Contact: <sip:1002@178.78.120.2:14314;transport=UDP>
  73.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>
  74.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  75.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  76.    CSeq: 2 INVITE
  77.    Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE
  78.    Content-Type: application/sdp
  79.    Proxy-Authorization: Digest username="1002",realm="voip.callhandling.co.uk",nonce="bf7f11bc-e8e0-4a03-9b5d-3f87fc3a4c8d",uri="sip:5000@voip.callhandling.co.uk;transport=UDP",response="2b3523ec08b474775da96b669f632737",cnonce="33fc3cfd89ff430419d31e1f3c2962df",nc=00000001,qop=auth,algorithm=MD5
  80.    User-Agent: Zoiper rd82a609
  81.    Allow-Events: presence, kpml, talk
  82.    Content-Length: 212
  83.    
  84.    v=0
  85.    o=Zoiper 0 0 IN IP4 10.0.0.69
  86.    s=Zoiper
  87.    c=IN IP4 10.0.0.69
  88.    t=0 0
  89.    m=audio 35812 RTP/AVP 0 8 101
  90.    a=rtpmap:0 PCMU/8000
  91.    a=rtpmap:8 PCMA/8000
  92.    a=rtpmap:101 telephone-event/8000
  93.    a=fmtp:101 0-16
  94.    a=sendrecv
  95.  
  96.  
  97.  
  98.  
  99.   SIP/2.0 100 Trying
  100.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---facebbbb04b4deae;rport=44612
  101.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  102.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>
  103.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  104.    CSeq: 2 INVITE
  105.    User-Agent: FreeSWITCH-mod_sofia/1.6.17-34-0fc0946~64bit
  106.    Content-Length: 0
  107.  
  108.  
  109.  
  110.  
  111.  SIP/2.0 200 OK
  112.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---facebbbb04b4deae;rport=44612
  113.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  114.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>;tag=BtcpBrF8Detcc
  115.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  116.    CSeq: 2 INVITE
  117.    Contact: <sip:5000@172.31.13.46:5060;transport=udp>
  118.    User-Agent: FreeSWITCH-mod_sofia/1.6.17-34-0fc0946~64bit
  119.    Accept: application/sdp
  120.    Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
  121.    Supported: timer, path, replaces
  122.    Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
  123.    Session-Expires: 120;refresher=uas
  124.    Content-Type: application/sdp
  125.    Content-Disposition: session
  126.    Content-Length: 220
  127.    Remote-Party-ID: "5000" <sip:5000@voip.callhandling.co.uk>;party=calling;privacy=off;screen=no
  128.    
  129.    v=0
  130.    o=FreeSWITCH 1497362985 1497362986 IN IP4 172.31.13.46
  131.    s=FreeSWITCH
  132.    c=IN IP4 172.31.13.46
  133.    t=0 0
  134.    m=audio 17160 RTP/AVP 0 101
  135.    a=rtpmap:0 PCMU/8000
  136.    a=rtpmap:101 telephone-event/8000
  137.    a=fmtp:101 0-16
  138.    a=ptime:20
  139.  
  140.  
  141.  
  142.  
  143. SIP/2.0 200 OK
  144.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---facebbbb04b4deae;rport=44612
  145.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  146.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>;tag=BtcpBrF8Detcc
  147.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  148.    CSeq: 2 INVITE
  149.    Contact: <sip:5000@172.31.13.46:5060;transport=udp>
  150.    User-Agent: FreeSWITCH-mod_sofia/1.6.17-34-0fc0946~64bit
  151.    Accept: application/sdp
  152.    Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
  153.    Supported: timer, path, replaces
  154.    Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
  155.    Session-Expires: 120;refresher=uas
  156.    Content-Type: application/sdp
  157.    Content-Disposition: session
  158.    Content-Length: 220
  159.    Remote-Party-ID: "5000" <sip:5000@voip.callhandling.co.uk>;party=calling;privacy=off;screen=no
  160.    
  161.    v=0
  162.    o=FreeSWITCH 1497362985 1497362986 IN IP4 172.31.13.46
  163.    s=FreeSWITCH
  164.    c=IN IP4 172.31.13.46
  165.    t=0 0
  166.    m=audio 17160 RTP/AVP 0 101
  167.    a=rtpmap:0 PCMU/8000
  168.    a=rtpmap:101 telephone-event/8000
  169.    a=fmtp:101 0-16
  170.    a=ptime:20
  171.  
  172.  
  173.  
  174.  SIP/2.0 200 OK
  175.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---facebbbb04b4deae;rport=44612
  176.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  177.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>;tag=BtcpBrF8Detcc
  178.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  179.    CSeq: 2 INVITE
  180.    Contact: <sip:5000@172.31.13.46:5060;transport=udp>
  181.    User-Agent: FreeSWITCH-mod_sofia/1.6.17-34-0fc0946~64bit
  182.    Accept: application/sdp
  183.    Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
  184.    Supported: timer, path, replaces
  185.    Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
  186.    Session-Expires: 120;refresher=uas
  187.    Content-Type: application/sdp
  188.    Content-Disposition: session
  189.    Content-Length: 220
  190.    Remote-Party-ID: "5000" <sip:5000@voip.callhandling.co.uk>;party=calling;privacy=off;screen=no
  191.    
  192.    v=0
  193.    o=FreeSWITCH 1497362985 1497362986 IN IP4 172.31.13.46
  194.    s=FreeSWITCH
  195.    c=IN IP4 172.31.13.46
  196.    t=0 0
  197.    m=audio 17160 RTP/AVP 0 101
  198.    a=rtpmap:0 PCMU/8000
  199.    a=rtpmap:101 telephone-event/8000
  200.    a=fmtp:101 0-16
  201.    a=ptime:20
  202.  
  203.  
  204.  
  205.  
  206.  
  207. SIP/2.0 200 OK
  208.    Via: SIP/2.0/UDP 178.78.120.2:14314;branch=z9hG4bK-524287-1---facebbbb04b4deae;rport=44612
  209.    From: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  210.    To: <sip:5000@voip.callhandling.co.uk;transport=UDP>;tag=BtcpBrF8Detcc
  211.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  212.    CSeq: 2 INVITE
  213.    Contact: <sip:5000@172.31.13.46:5060;transport=udp>
  214.    User-Agent: FreeSWITCH-mod_sofia/1.6.17-34-0fc0946~64bit
  215.    Accept: application/sdp
  216.    Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
  217.    Supported: timer, path, replaces
  218.    Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
  219.    Session-Expires: 120;refresher=uas
  220.    Content-Type: application/sdp
  221.    Content-Disposition: session
  222.    Content-Length: 220
  223.    Remote-Party-ID: "5000" <sip:5000@voip.callhandling.co.uk>;party=calling;privacy=off;screen=no
  224.    
  225.    v=0
  226.    o=FreeSWITCH 1497362985 1497362986 IN IP4 172.31.13.46
  227.    s=FreeSWITCH
  228.    c=IN IP4 172.31.13.46
  229.    t=0 0
  230.    m=audio 17160 RTP/AVP 0 101
  231.    a=rtpmap:0 PCMU/8000
  232.    a=rtpmap:101 telephone-event/8000
  233.    a=fmtp:101 0-16
  234.    a=ptime:20
  235.    
  236.    
  237.    
  238.    
  239.    
  240.    BYE sip:1002@178.78.120.2:14314;transport=UDP SIP/2.0
  241.    Via: SIP/2.0/UDP 172.31.13.46;rport;branch=z9hG4bK8263tFUmgUpBS
  242.    Max-Forwards: 70
  243.    From: <sip:5000@voip.callhandling.co.uk;transport=UDP>;tag=BtcpBrF8Detcc
  244.    To: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  245.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  246.    CSeq: 108354024 BYE
  247.    Contact: <sip:5000@172.31.13.46:5060;transport=udp>
  248.    User-Agent: FreeSWITCH-mod_sofia/1.6.17-34-0fc0946~64bit
  249.    Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
  250.    Supported: timer, path, replaces
  251.    Reason: SIP;cause=408;text="ACK Timeout"
  252.    Content-Length: 0
  253.  
  254.  
  255.  
  256.  
  257.  
  258. SIP/2.0 200 OK
  259.    Via: SIP/2.0/UDP 172.31.13.46;rport=5060;branch=z9hG4bK8263tFUmgUpBS;received=52.50.64.102
  260.    Contact: <sip:1002@178.78.120.2:14314;transport=UDP>
  261.    To: <sip:1002@voip.callhandling.co.uk;transport=UDP>;tag=cf0f4921
  262.    From: <sip:5000@voip.callhandling.co.uk;transport=UDP>;tag=BtcpBrF8Detcc
  263.    Call-ID: iuhstpyxhRRpUdTu6CMgUA..
  264.    CSeq: 108354024 BYE
  265.    User-Agent: Zoiper rd82a609
  266.    Content-Length: 0
  267.  
  268.  
  269.  
  270.  
  271.  
  272.  
  273.    
  274.  
  275.  
  276.