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    <p>Send the full trace for not working scenario, from invite to
      cancel, it is hard to track from two partial traces, small bits
      can make difference here, so if these call-id, branch, tags are
      different, then I have to work on guessing, ...</p>
    <p>Cheers,<br>
      Daniel<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 19.04.18 11:00, Kelvin Chua wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAMF97-cHQ-Rc7QDtycTKdqAmfhJzNYCfkx5o=8sQP__-tj9LGg@mail.gmail.com">
      <div dir="ltr">yes i have it, sorry i missed that part, they are
        identical except for Call-ID, tag, branch
        <div><br>
        </div>
        <div>
          <div>U 2018/04/19 05:31:30.319735 w.x.y.z:34439 ->
            a.b.c.d:6060</div>
          <div>INVITE <a class="moz-txt-link-freetext" href="sip:408@a.b.c.d:6060;transport=UDP">sip:408@a.b.c.d:6060;transport=UDP</a> SIP/2.0.</div>
          <div>Via: SIP/2.0/UDP
            w.x.y.z:34439;branch=z9hG4bK-524287-1---b186786334147b7d;rport.</div>
          <div>Max-Forwards: 70.</div>
          <div>Contact: <a class="moz-txt-link-rfc2396E" href="sip:kelvin@w.x.y.z:34439;transport=UDP"><sip:kelvin@w.x.y.z:34439;transport=UDP></a>.</div>
          <div>To: <a class="moz-txt-link-rfc2396E" href="sip:408@a.b.c.d:6060;transport=UDP"><sip:408@a.b.c.d:6060;transport=UDP></a>.</div>
          <div>From:
            <a class="moz-txt-link-rfc2396E" href="sip:kelvin@a.b.c.d:6060;transport=UDP"><sip:kelvin@a.b.c.d:6060;transport=UDP></a>;tag=d75e236e.</div>
          <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
          <div>CSeq: 1 INVITE.</div>
          <div>Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE,
            OPTIONS, INFO, SUBSCRIBE.</div>
          <div>Content-Type: application/sdp.</div>
          <div>User-Agent: Zoiper rv2.8.87-mod.</div>
          <div>Allow-Events: presence, kpml, talk.</div>
          <div>Content-Length: 243.</div>
          <div>.</div>
          <div>v=0.</div>
          <div>o=Zoiper 0 0 IN IP4 192.168.1.234.</div>
          <div>s=Zoiper.</div>
          <div>c=IN IP4 192.168.1.234.</div>
          <div>t=0 0.</div>
          <div>m=audio 38678 RTP/AVP 3 101 0 8.</div>
          <div>a=rtpmap:3 GSM/8000.</div>
          <div>a=rtpmap:101 telephone-event/8000.</div>
          <div>a=fmtp:101 0-16.</div>
          <div>a=rtpmap:0 PCMU/8000.</div>
          <div>a=rtpmap:8 PCMA/8000.</div>
          <div>a=sendrecv.</div>
          <div><br>
          </div>
          <div><br>
          </div>
          <div>U 2018/04/19 05:31:30.320283 a.b.c.d:6060 ->
            w.x.y.z:34439</div>
          <div>SIP/2.0 100 Trying.</div>
          <div>Via: SIP/2.0/UDP
w.x.y.z:34439;branch=z9hG4bK-524287-1---b186786334147b7d;rport=34439;received=w.x.y.z.</div>
          <div>To: <a class="moz-txt-link-rfc2396E" href="sip:408@a.b.c.d:6060;transport=UDP"><sip:408@a.b.c.d:6060;transport=UDP></a>.</div>
          <div>From:
            <a class="moz-txt-link-rfc2396E" href="sip:kelvin@a.b.c.d:6060;transport=UDP"><sip:kelvin@a.b.c.d:6060;transport=UDP></a>;tag=d75e236e.</div>
          <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
          <div>CSeq: 1 INVITE.</div>
          <div>Server: <span
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">kamailio
              (5.1.2 (x86_64/linux))</span>.</div>
          <div>Content-Length: 0.</div>
          <div>.</div>
        </div>
        <div><br>
        </div>
      </div>
      <div class="gmail_extra"><br clear="all">
        <div>
          <div class="gmail_signature" data-smartmail="gmail_signature">Kelvin
            Chua</div>
        </div>
        <br>
        <div class="gmail_quote">On Thu, Apr 19, 2018 at 4:14 PM,
          Daniel-Constantin Mierla <span dir="ltr"><<a
              href="mailto:miconda@gmail.com" target="_blank"
              moz-do-not-send="true">miconda@gmail.com</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div text="#000000" bgcolor="#FFFFFF">
              <p>The INVITE from w.x.y.z:44308 -> a.b.c.d:6060 is not
                given. That's the one that is needed in order to match
                the CANCEL, which comes from w.x.y.z.</p>
              <p>Can you provide it?<br>
              </p>
              Cheers,<br>
              Daniel
              <div>
                <div class="h5"><br>
                  <br>
                  <div class="m_1384436471508695471moz-cite-prefix">On
                    19.04.18 09:47, Kelvin Chua wrote:<br>
                  </div>
                  <blockquote type="cite">
                    <div dir="ltr"><font size="4"><b>here is an ngrep of
                          the working one</b></font>
                      <div><br>
                      </div>
                      <div>
                        <div>U 2018/04/19 05:31:31.112392 a.b.c.d:6060
                          -> a.b.c.d:5090</div>
                        <div>INVITE <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Record-Route: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:6060;lr;ftag=<wbr>d75e236e;nat=yes></a>.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bK638a.<wbr>ebce2b6669d2c54149bcc613c89d65<wbr>10.1.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>4c57b6fa8ff74676;rport=34439.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>Contact: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@w.x.y.z:34439;<wbr>transport=UDP;alias=w.x.y.z~<wbr>34439~1></a>.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>P-Called-Identity: 408.</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Allow: INVITE, ACK, CANCEL, BYE, NOTIFY,
                          REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE.</div>
                        <div>Content-Type: application/sdp.</div>
                        <div>Proxy-Authorization: Digest
                          username="kelvin",realm="<a
                            href="http://domain.com" target="_blank"
                            moz-do-not-send="true">domai<wbr>n.com</a>",nonce="<wbr>3861e6cdaf8a44cce98721e3c8dda4<wbr>28",uri=<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true">"sip:408@a.b.c.d:6060;<wbr>transport=UDP"</a>,response="<wbr>b7a365bd35650736c45d2048d924ea<wbr>0b",cnonce="<wbr>492da67adf4a5853f0aa012c2fa5a7<wbr>57",nc=00000001,qop=auth,<wbr>algorithm=MD5.</div>
                        <div>User-Agent: Zoiper rv2.8.87-mod.</div>
                        <div>Allow-Events: presence, kpml, talk.</div>
                        <div>Content-Length: 255.</div>
                        <div>P-Called-Party-ID: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>.</div>
                        <div>v=0.</div>
                        <div>o=Zoiper 0 0 IN IP4 a.b.c.d.</div>
                        <div>s=Zoiper.</div>
                        <div>c=IN IP4 a.b.c.d.</div>
                        <div>t=0 0.</div>
                        <div>m=audio 19592 RTP/AVP 3 101 0 8.</div>
                        <div>a=rtpmap:3 GSM/8000.</div>
                        <div>a=rtpmap:101 telephone-event/8000.</div>
                        <div>a=fmtp:101 0-16.</div>
                        <div>a=rtpmap:0 PCMU/8000.</div>
                        <div>a=rtpmap:8 PCMA/8000.</div>
                        <div>a=sendrecv.</div>
                        <div>a=rtcp:19593.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:31.180853 a.b.c.d:5090
                          -> a.b.c.d:6060</div>
                        <div>SIP/2.0 100 Trying.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bK638a.<wbr>ebce2b6669d2c54149bcc613c89d65<wbr>10.1.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>4c57b6fa8ff74676;rport=34439.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Server: kamailio (5.1.2 (x86_64/linux)).</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:35.134023 a.b.c.d:5090
                          -> a.b.c.d:6060</div>
                        <div>SIP/2.0 183 Session Progress.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bK638a.<wbr>ebce2b6669d2c54149bcc613c89d65<wbr>10.1.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>4c57b6fa8ff74676;rport=34439.</div>
                        <div>Record-Route:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:5090;lr=on;ftag=<wbr>d75e236e;did=208.b272;ReIn=<wbr>true></a>,<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:6060;lr;<wbr>ftag=d75e236e;nat=yes></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>r5eFv3QrQD71H.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Contact: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:e.f.g.h;did=2082.<wbr>1aaa8341></a>.</div>
                        <div>User-Agent: SIP.</div>
                        <div>Accept: application/sdp.</div>
                        <div>Allow: INVITE, ACK, BYE, CANCEL, OPTIONS,
                          MESSAGE, INFO, UPDATE, REGISTER, REFER,
                          NOTIFY.</div>
                        <div>Supported: timer, path, replaces.</div>
                        <div>Allow-Events: talk, hold, conference,
                          refer.</div>
                        <div>Content-Type: application/sdp.</div>
                        <div>Content-Disposition: session.</div>
                        <div>Content-Length: 222.</div>
                        <div>.</div>
                        <div>v=0.</div>
                        <div>o=UAC 23521 12211 IN IP4 23.29.25.68.</div>
                        <div>s=SIP Media Capabilities.</div>
                        <div>c=IN IP4 23.29.25.74.</div>
                        <div>t=0 0.</div>
                        <div>m=audio 25694 RTP/AVP 0 101.</div>
                        <div>a=rtpmap:0 PCMU/8000.</div>
                        <div>a=rtpmap:101 telephone-event/8000.</div>
                        <div>a=fmtp:101 0-15.</div>
                        <div>a=maxptime:20.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:35.134763 a.b.c.d:6060
                          -> w.x.y.z:34439</div>
                        <div>SIP/2.0 183 Session Progress.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>4c57b6fa8ff74676;rport=34439.</div>
                        <div>Record-Route:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:5090;lr=on;ftag=<wbr>d75e236e;did=208.b272;ReIn=<wbr>true></a>,<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:6060;lr;<wbr>ftag=d75e236e;nat=yes></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>r5eFv3QrQD71H.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Contact: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:e.f.g.h;did=2082.<wbr>1aaa8341></a>.</div>
                        <div>User-Agent: SIP.</div>
                        <div>Accept: application/sdp.</div>
                        <div>Allow: INVITE, ACK, BYE, CANCEL, OPTIONS,
                          MESSAGE, INFO, UPDATE, REGISTER, REFER,
                          NOTIFY.</div>
                        <div>Supported: timer, path, replaces.</div>
                        <div>Allow-Events: talk, hold, conference,
                          refer.</div>
                        <div>Content-Type: application/sdp.</div>
                        <div>Content-Disposition: session.</div>
                        <div>Content-Length: 250.</div>
                        <div>.</div>
                        <div>v=0.</div>
                        <div>o=UAC 23521 12211 IN IP4 a.b.c.d.</div>
                        <div>s=SIP Media Capabilities.</div>
                        <div>c=IN IP4 a.b.c.d.</div>
                        <div>t=0 0.</div>
                        <div>m=audio 19610 RTP/AVP 0 101.</div>
                        <div>a=rtpmap:0 PCMU/8000.</div>
                        <div>a=rtpmap:101 telephone-event/8000.</div>
                        <div>a=fmtp:101 0-15.</div>
                        <div>a=maxptime:20.</div>
                        <div>a=sendrecv.</div>
                        <div>a=rtcp:19611.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:36.054719 w.x.y.z:34439
                          -> a.b.c.d:6060</div>
                        <div>CANCEL <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;branch=z9hG4bK-<wbr>524287-1---4c57b6fa8ff74676;<wbr>rport.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 CANCEL.</div>
                        <div>Proxy-Authorization: Digest
                          username="kelvin",realm="<a
                            href="http://domain.com" target="_blank"
                            moz-do-not-send="true">domai<wbr>n.com</a>",nonce="<wbr>3861e6cdaf8a44cce98721e3c8dda4<wbr>28",uri=<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true">"sip:408@a.b.c.d:6060;<wbr>transport=UDP"</a>,response="<wbr>8cace32bdff1bc61974d61c8a56238<wbr>dd",cnonce="<wbr>030abc48cc862c50cf8bd3d0e61844<wbr>f3",nc=00000002,qop=auth,<wbr>algorithm=MD5.</div>
                        <div>User-Agent: Zoiper rv2.8.87-mod.</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:36.055183 a.b.c.d:6060
                          -> a.b.c.d:5090</div>
                        <div>CANCEL <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bK638a.<wbr>ebce2b6669d2c54149bcc613c89d65<wbr>10.1.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 CANCEL.</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:36.055259 a.b.c.d:6060
                          -> w.x.y.z:34439</div>
                        <div>SIP/2.0 200 canceling.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;branch=z9hG4bK-<wbr>524287-1---4c57b6fa8ff74676;<wbr>rport=34439;received=w.x.y.z.</div>
                        <div>To:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>f072ba6a4747058fd2933a88d05e31<wbr>a8-77fc.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 CANCEL.</div>
                        <div>Server: Sipsurge Overlord/<a
                            href="http://1.0.0." target="_blank"
                            moz-do-not-send="true">1.0.0.</a></div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:36.055443 a.b.c.d:5090
                          -> a.b.c.d:6060</div>
                        <div>SIP/2.0 200 canceling.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bK638a.<wbr>ebce2b6669d2c54149bcc613c89d65<wbr>10.1.</div>
                        <div>To:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>886d45488eeb4821dd4d3b48f23498<wbr>38-53f2.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 CANCEL.</div>
                        <div>Server: kamailio (5.1.2 (x86_64/linux)).</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:36.059120 a.b.c.d:5090
                          -> a.b.c.d:6060</div>
                        <div>SIP/2.0 487 Request Terminated.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bK638a.<wbr>ebce2b6669d2c54149bcc613c89d65<wbr>10.1.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>4c57b6fa8ff74676;rport=34439.</div>
                        <div>To:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>886d45488eeb4821dd4d3b48f23498<wbr>38-53f2.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Server: kamailio (5.1.2 (x86_64/linux)).</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:36.059306 a.b.c.d:6060
                          -> a.b.c.d:5090</div>
                        <div>ACK <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bK638a.<wbr>ebce2b6669d2c54149bcc613c89d65<wbr>10.1.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>To:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>886d45488eeb4821dd4d3b48f23498<wbr>38-53f2.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 ACK.</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:36.060030 a.b.c.d:6060
                          -> w.x.y.z:34439</div>
                        <div>SIP/2.0 487 Request Terminated.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>4c57b6fa8ff74676;rport=34439.</div>
                        <div>To:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>886d45488eeb4821dd4d3b48f23498<wbr>38-53f2.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Server: kamailio (5.1.2 (x86_64/linux)).</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 05:31:36.262168 w.x.y.z:34439
                          -> a.b.c.d:6060</div>
                        <div>ACK <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:34439;branch=z9hG4bK-<wbr>524287-1---4c57b6fa8ff74676;<wbr>rport.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>To:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>886d45488eeb4821dd4d3b48f23498<wbr>38-53f2.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=d75e236e.</div>
                        <div>Call-ID: 7O090_g-Ndh_I22Zi5ZOhQ...</div>
                        <div>CSeq: 2 ACK.</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                      </div>
                      <div><br>
                      </div>
                      <div><br>
                      </div>
                      <div><br>
                      </div>
                      <div><font size="4"><b>and then ngrep of the
                            non-matching one</b></font></div>
                      <div><br>
                      </div>
                      <div>
                        <div>U 2018/04/19 04:39:43.137832 a.b.c.d:6060
                          -> a.b.c.d:5090</div>
                        <div>INVITE <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Record-Route: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:6060;lr;ftag=<wbr>88ab0030;nat=yes></a>.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bKcd06.<wbr>5537814be9e2ae1fe1f60daf1fb39e<wbr>03.1.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:44308;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>bac673a0af203e10;rport=44308.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>Contact: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@w.x.y.z:44308;<wbr>transport=UDP;alias=w.x.y.z~<wbr>44308~1></a>.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=88ab0030.</div>
                        <div>Call-ID: qXQ2PEtXgehz4CQYo2ryLg...</div>
                        <div>P-Called-Identity: 408.</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Allow: INVITE, ACK, CANCEL, BYE, NOTIFY,
                          REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE.</div>
                        <div>Content-Type: application/sdp.</div>
                        <div>Proxy-Authorization: Digest
                          username="kelvin",realm="<a
                            href="http://domain.com" target="_blank"
                            moz-do-not-send="true">domai<wbr>n.com</a>",nonce="<wbr>815682331c7aaddbff9a28548d8756<wbr>52",uri=<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true">"sip:408@a.b.c.d:6060;<wbr>transport=UDP"</a>,response="<wbr>c5147959ff30db5eb9d38fb7ec796a<wbr>68",cnonce="<wbr>3496cd726af47c79a4725f83f74c7d<wbr>98",nc=00000001,qop=auth,<wbr>algorithm=MD5.</div>
                        <div>User-Agent: Zoiper rv2.8.87-mod.</div>
                        <div>Allow-Events: presence, kpml, talk.</div>
                        <div>Content-Length: 255.</div>
                        <div>P-Called-Party-ID: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>.</div>
                        <div>v=0.</div>
                        <div>o=Zoiper 0 0 IN IP4 a.b.c.d.</div>
                        <div>s=Zoiper.</div>
                        <div>c=IN IP4 a.b.c.d.</div>
                        <div>t=0 0.</div>
                        <div>m=audio 19554 RTP/AVP 3 101 0 8.</div>
                        <div>a=rtpmap:3 GSM/8000.</div>
                        <div>a=rtpmap:101 telephone-event/8000.</div>
                        <div>a=fmtp:101 0-16.</div>
                        <div>a=rtpmap:0 PCMU/8000.</div>
                        <div>a=rtpmap:8 PCMA/8000.</div>
                        <div>a=sendrecv.</div>
                        <div>a=rtcp:19555.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 04:39:43.202106 a.b.c.d:5090
                          -> a.b.c.d:6060</div>
                        <div>SIP/2.0 100 Trying.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bKcd06.<wbr>5537814be9e2ae1fe1f60daf1fb39e<wbr>03.1.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:44308;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>bac673a0af203e10;rport=44308.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=88ab0030.</div>
                        <div>Call-ID: qXQ2PEtXgehz4CQYo2ryLg...</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Server: kamailio (5.1.2 (x86_64/linux)).</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 04:39:47.400412 a.b.c.d:5090
                          -> a.b.c.d:6060</div>
                        <div>SIP/2.0 183 Session Progress.</div>
                        <div>Via: SIP/2.0/UDP a.b.c.d:6060;branch=<wbr>z9hG4bKcd06.<wbr>5537814be9e2ae1fe1f60daf1fb39e<wbr>03.1.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:44308;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>bac673a0af203e10;rport=44308.</div>
                        <div>Record-Route:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:5090;lr=on;ftag=<wbr>88ab0030;did=8a.f2c2;ReIn=<wbr>true></a>,<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:6060;lr;<wbr>ftag=88ab0030;nat=yes></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=88ab0030.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>cp1SQvQ6SNSaH.</div>
                        <div>Call-ID: qXQ2PEtXgehz4CQYo2ryLg...</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Contact: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:e.f.g.h;did=8a06.<wbr>2a2c6204></a>.</div>
                        <div>User-Agent: SIP.</div>
                        <div>Accept: application/sdp.</div>
                        <div>Allow: INVITE, ACK, BYE, CANCEL, OPTIONS,
                          MESSAGE, INFO, UPDATE, REGISTER, REFER,
                          NOTIFY.</div>
                        <div>Supported: timer, path, replaces.</div>
                        <div>Allow-Events: talk, hold, conference,
                          refer.</div>
                        <div>Content-Type: application/sdp.</div>
                        <div>Content-Disposition: session.</div>
                        <div>Content-Length: 221.</div>
                        <div>.</div>
                        <div>v=0.</div>
                        <div>o=UAC 7006 20280 IN IP4 23.29.21.84.</div>
                        <div>s=SIP Media Capabilities.</div>
                        <div>c=IN IP4 23.29.21.91.</div>
                        <div>t=0 0.</div>
                        <div>m=audio 27104 RTP/AVP 0 101.</div>
                        <div>a=rtpmap:0 PCMU/8000.</div>
                        <div>a=rtpmap:101 telephone-event/8000.</div>
                        <div>a=fmtp:101 0-15.</div>
                        <div>a=maxptime:20.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 04:39:47.401210 a.b.c.d:6060
                          -> w.x.y.z:44308</div>
                        <div>SIP/2.0 183 Session Progress.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:44308;received=w.x.y.<wbr>z;branch=z9hG4bK-524287-1---<wbr>bac673a0af203e10;rport=44308.</div>
                        <div>Record-Route:
                          <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:5090;lr=on;ftag=<wbr>88ab0030;did=8a.f2c2;ReIn=<wbr>true></a>,<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:a.b.c.d:6060;lr;<wbr>ftag=88ab0030;nat=yes></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=88ab0030.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=<wbr>cp1SQvQ6SNSaH.</div>
                        <div>Call-ID: qXQ2PEtXgehz4CQYo2ryLg...</div>
                        <div>CSeq: 2 INVITE.</div>
                        <div>Contact: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:e.f.g.h;did=8a06.<wbr>2a2c6204></a>.</div>
                        <div>User-Agent: SIP.</div>
                        <div>Accept: application/sdp.</div>
                        <div>Allow: INVITE, ACK, BYE, CANCEL, OPTIONS,
                          MESSAGE, INFO, UPDATE, REGISTER, REFER,
                          NOTIFY.</div>
                        <div>Supported: timer, path, replaces.</div>
                        <div>Allow-Events: talk, hold, conference,
                          refer.</div>
                        <div>Content-Type: application/sdp.</div>
                        <div>Content-Disposition: session.</div>
                        <div>Content-Length: 249.</div>
                        <div>.</div>
                        <div>v=0.</div>
                        <div>o=UAC 7006 20280 IN IP4 a.b.c.d.</div>
                        <div>s=SIP Media Capabilities.</div>
                        <div>c=IN IP4 a.b.c.d.</div>
                        <div>t=0 0.</div>
                        <div>m=audio 19576 RTP/AVP 0 101.</div>
                        <div>a=rtpmap:0 PCMU/8000.</div>
                        <div>a=rtpmap:101 telephone-event/8000.</div>
                        <div>a=fmtp:101 0-15.</div>
                        <div>a=maxptime:20.</div>
                        <div>a=sendrecv.</div>
                        <div>a=rtcp:19577.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 04:39:49.552641 w.x.y.z:44308
                          -> a.b.c.d:6060</div>
                        <div>CANCEL <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:44308;branch=z9hG4bK-<wbr>524287-1---bac673a0af203e10;<wbr>rport.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=88ab0030.</div>
                        <div>Call-ID: qXQ2PEtXgehz4CQYo2ryLg...</div>
                        <div>CSeq: 2 CANCEL.</div>
                        <div>Proxy-Authorization: Digest
                          username="kelvin",realm="<a
                            href="http://domain.com" target="_blank"
                            moz-do-not-send="true">domai<wbr>n.com</a>",nonce="<wbr>815682331c7aaddbff9a28548d8756<wbr>52",uri=<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true">"sip:408@a.b.c.d:6060;<wbr>transport=UDP"</a>,response="<wbr>3e161bd546cdd5e8876cb48ffdfaee<wbr>a0",cnonce="<wbr>d1ca4c1b6e427869e795f7da457b3e<wbr>ef",nc=00000002,qop=auth,<wbr>algorithm=MD5.</div>
                        <div>User-Agent: Zoiper rv2.8.87-mod.</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 04:39:50.050153 w.x.y.z:44308
                          -> a.b.c.d:6060</div>
                        <div>CANCEL <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:44308;branch=z9hG4bK-<wbr>524287-1---bac673a0af203e10;<wbr>rport.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=88ab0030.</div>
                        <div>Call-ID: qXQ2PEtXgehz4CQYo2ryLg...</div>
                        <div>CSeq: 2 CANCEL.</div>
                        <div>Proxy-Authorization: Digest
                          username="kelvin",realm="<a
                            href="http://domain.com" target="_blank"
                            moz-do-not-send="true">domai<wbr>n.com</a>",nonce="<wbr>815682331c7aaddbff9a28548d8756<wbr>52",uri=<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true">"sip:408@a.b.c.d:6060;<wbr>transport=UDP"</a>,response="<wbr>3e161bd546cdd5e8876cb48ffdfaee<wbr>a0",cnonce="<wbr>d1ca4c1b6e427869e795f7da457b3e<wbr>ef",nc=00000002,qop=auth,<wbr>algorithm=MD5.</div>
                        <div>User-Agent: Zoiper rv2.8.87-mod.</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 04:39:51.048945 w.x.y.z:44308
                          -> a.b.c.d:6060</div>
                        <div>CANCEL <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:44308;branch=z9hG4bK-<wbr>524287-1---bac673a0af203e10;<wbr>rport.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=88ab0030.</div>
                        <div>Call-ID: qXQ2PEtXgehz4CQYo2ryLg...</div>
                        <div>CSeq: 2 CANCEL.</div>
                        <div>Proxy-Authorization: Digest
                          username="kelvin",realm="<a
                            href="http://domain.com" target="_blank"
                            moz-do-not-send="true">domai<wbr>n.com</a>",nonce="<wbr>815682331c7aaddbff9a28548d8756<wbr>52",uri=<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true">"sip:408@a.b.c.d:6060;<wbr>transport=UDP"</a>,response="<wbr>3e161bd546cdd5e8876cb48ffdfaee<wbr>a0",cnonce="<wbr>d1ca4c1b6e427869e795f7da457b3e<wbr>ef",nc=00000002,qop=auth,<wbr>algorithm=MD5.</div>
                        <div>User-Agent: Zoiper rv2.8.87-mod.</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                        <div>U 2018/04/19 04:39:53.049231 w.x.y.z:44308
                          -> a.b.c.d:6060</div>
                        <div>CANCEL <a
                            class="m_1384436471508695471moz-txt-link-freetext"
                            moz-do-not-send="true">sip:408@a.b.c.d:6060;<wbr>transport=UDP</a>
                          SIP/2.0.</div>
                        <div>Via: SIP/2.0/UDP
                          w.x.y.z:44308;branch=z9hG4bK-<wbr>524287-1---bac673a0af203e10;<wbr>rport.</div>
                        <div>Max-Forwards: 70.</div>
                        <div>To: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:408@a.b.c.d:6060;<wbr>transport=UDP></a>.</div>
                        <div>From: <a
                            class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true"><sip:kelvin@a.b.c.d:6060;<wbr>transport=UDP></a>;tag=88ab0030.</div>
                        <div>Call-ID: qXQ2PEtXgehz4CQYo2ryLg...</div>
                        <div>CSeq: 2 CANCEL.</div>
                        <div>Proxy-Authorization: Digest
                          username="kelvin",realm="<a
                            href="http://domain.com" target="_blank"
                            moz-do-not-send="true">domai<wbr>n.com</a>",nonce="<wbr>815682331c7aaddbff9a28548d8756<wbr>52",uri=<a
class="m_1384436471508695471moz-txt-link-rfc2396E"
                            moz-do-not-send="true">"sip:408@a.b.c.d:6060;<wbr>transport=UDP"</a>,response="<wbr>3e161bd546cdd5e8876cb48ffdfaee<wbr>a0",cnonce="<wbr>d1ca4c1b6e427869e795f7da457b3e<wbr>ef",nc=00000002,qop=auth,<wbr>algorithm=MD5.</div>
                        <div>User-Agent: Zoiper rv2.8.87-mod.</div>
                        <div>Content-Length: 0.</div>
                        <div>.</div>
                      </div>
                      <div><br>
                      </div>
                      <div><br>
                      </div>
                      <div><br>
                      </div>
                    </div>
                    <div class="gmail_extra"><br clear="all">
                      <div>
                        <div
                          class="m_1384436471508695471gmail_signature"
                          data-smartmail="gmail_signature">Kelvin Chua</div>
                      </div>
                      <br>
                      <div class="gmail_quote">On Wed, Apr 18, 2018 at
                        11:22 PM, Daniel-Constantin Mierla <span
                          dir="ltr"><<a
                            href="mailto:miconda@gmail.com"
                            target="_blank" moz-do-not-send="true">miconda@gmail.com</a>></span>
                        wrote:<br>
                        <blockquote class="gmail_quote" style="margin:0
                          0 0 .8ex;border-left:1px #ccc
                          solid;padding-left:1ex">
                          <div text="#000000" bgcolor="#FFFFFF">
                            <p>Hello,</p>
                            <p>do you have a pcap with all messages for
                              such call (invite, replies, cancel)? It is
                              important to see if the transaction
                              matching elements are properly set.</p>
                            <p>In general, the rule for cancel is to be
                              sent in the same way (with the same
                              elements) as the invite, because cancel is
                              not a standalone transaction, it must
                              match the associated invite one.<br>
                            </p>
                            Cheers,<br>
                            Daniel
                            <div>
                              <div class="m_1384436471508695471h5"><br>
                                <br>
                                <div
                                  class="m_1384436471508695471m_-4482268004969300870moz-cite-prefix">On
                                  18.04.18 16:59, Kelvin Chua wrote:<br>
                                </div>
                                <blockquote type="cite">
                                  <div dir="auto">after couple of tests,
                                    it is still hit and miss, sometimes
                                    it matches, sometimes it does not.</div>
                                  <br>
                                  <div class="gmail_quote">
                                    <div dir="ltr">On Wed, Apr 18, 2018,
                                      6:47 PM Kelvin Chua <<a
                                        href="mailto:kelchy@gmail.com"
                                        target="_blank"
                                        moz-do-not-send="true">kelchy@gmail.com</a>>
                                      wrote:<br>
                                    </div>
                                    <blockquote class="gmail_quote"
                                      style="margin:0 0 0
                                      .8ex;border-left:1px #ccc
                                      solid;padding-left:1ex">
                                      <div dir="ltr">thanks alex, will
                                        test this out further but looks
                                        good at the moment
                                        <div>any idea why it is not
                                          matching when RURI has the
                                          port if i only use
                                          t_check_trans() and relay?</div>
                                      </div>
                                      <div class="gmail_extra"><br
                                          clear="all">
                                        <div>
                                          <div
class="m_1384436471508695471m_-4482268004969300870m_8706939025228119807gmail_signature"
data-smartmail="gmail_signature">Kelvin Chua</div>
                                        </div>
                                        <br>
                                        <div class="gmail_quote">On Wed,
                                          Apr 18, 2018 at 3:44 PM, Alex
                                          Balashov <span dir="ltr"><<a
href="mailto:abalashov@evaristesys.com" rel="noreferrer" target="_blank"
                                              moz-do-not-send="true">abalashov@evaristesys.com</a>></span>
                                          wrote:<br>
                                          <blockquote
                                            class="gmail_quote"
                                            style="margin:0 0 0
                                            .8ex;border-left:1px #ccc
                                            solid;padding-left:1ex">Try
                                            this instead:<br>
                                            <br>
                                               route {<br>
                                                  ...<br>
                                            <br>
                                                  t_check_trans();<br>
                                            <br>
                                                  ...<br>
                                            <br>
                                                 
                                            if(is_method("CANCEL")) {<br>
                                                   
                                             if(!t_relay_cancel()) <br>
                                                       
                                            sl_send_reply("500",
                                            "Internal Server Error");<br>
                                            <br>
                                                     exit;<br>
                                                  }<br>
                                               }<br>
                                            <span
class="m_1384436471508695471m_-4482268004969300870m_8706939025228119807HOEnZb"><font
                                                color="#888888"><br>
                                                -- Alex<br>
                                                <br>
                                                -- <br>
                                                Alex Balashov |
                                                Principal | Evariste
                                                Systems LLC<br>
                                                <br>
                                                Tel: +1-706-510-6800 /
                                                +1-800-250-5920
                                                (toll-free) <br>
                                                Web: <a
                                                  href="http://www.evaristesys.com/"
                                                  rel="noreferrer
                                                  noreferrer"
                                                  target="_blank"
                                                  moz-do-not-send="true">http://www.evaristesys.com/</a>,
                                                <a
                                                  href="http://www.csrpswitch.com/"
                                                  rel="noreferrer
                                                  noreferrer"
                                                  target="_blank"
                                                  moz-do-not-send="true">http://www.csrpswitch.com/</a><br>
                                                <br>
______________________________<wbr>_________________<br>
                                                Kamailio (SER) - Users
                                                Mailing List<br>
                                                <a
                                                  href="mailto:sr-users@lists.kamailio.org"
                                                  rel="noreferrer"
                                                  target="_blank"
                                                  moz-do-not-send="true">sr-users@lists.kamailio.org</a><br>
                                                <a
                                                  href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users"
                                                  rel="noreferrer
                                                  noreferrer"
                                                  target="_blank"
                                                  moz-do-not-send="true">https://lists.kamailio.org/cgi<wbr>-bin/mailman/listinfo/sr-users</a><br>
                                              </font></span></blockquote>
                                        </div>
                                        <br>
                                      </div>
                                    </blockquote>
                                  </div>
                                  <br>
                                  <fieldset
                                    class="m_1384436471508695471m_-4482268004969300870mimeAttachmentHeader"></fieldset>
                                  <br>
                                  <pre>______________________________<wbr>_________________
Kamailio (SER) - Users Mailing List
<a class="m_1384436471508695471m_-4482268004969300870moz-txt-link-abbreviated" href="mailto:sr-users@lists.kamailio.org" target="_blank" moz-do-not-send="true">sr-users@lists.kamailio.org</a>
<a class="m_1384436471508695471m_-4482268004969300870moz-txt-link-freetext" href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users" target="_blank" moz-do-not-send="true">https://lists.kamailio.org/cgi<wbr>-bin/mailman/listinfo/sr-users</a>
</pre>
                                </blockquote>
                                <br>
                              </div>
                            </div>
                            <span class="m_1384436471508695471HOEnZb"><font
                                color="#888888">
                                <pre class="m_1384436471508695471m_-4482268004969300870moz-signature" cols="72">-- 
Daniel-Constantin Mierla
<a class="m_1384436471508695471m_-4482268004969300870moz-txt-link-abbreviated" href="http://www.twitter.com/miconda" target="_blank" moz-do-not-send="true">www.twitter.com/miconda</a> -- <a class="m_1384436471508695471m_-4482268004969300870moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda" target="_blank" moz-do-not-send="true">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training - April 16-18, 2018, Berlin - <a class="m_1384436471508695471m_-4482268004969300870moz-txt-link-abbreviated" href="http://www.asipto.com" target="_blank" moz-do-not-send="true">www.asipto.com</a>
Kamailio World Conference - May 14-16, 2018 - <a class="m_1384436471508695471m_-4482268004969300870moz-txt-link-abbreviated" href="http://www.kamailioworld.com" target="_blank" moz-do-not-send="true">www.kamailioworld.com</a></pre>
                              </font></span></div>
                        </blockquote>
                      </div>
                      <br>
                    </div>
                  </blockquote>
                  <br>
                  <pre class="m_1384436471508695471moz-signature" cols="72">-- 
Daniel-Constantin Mierla
<a class="m_1384436471508695471moz-txt-link-abbreviated" href="http://www.twitter.com/miconda" target="_blank" moz-do-not-send="true">www.twitter.com/miconda</a> -- <a class="m_1384436471508695471moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda" target="_blank" moz-do-not-send="true">www.linkedin.com/in/miconda</a>
Kamailio World Conference - May 14-16, 2018 - <a class="m_1384436471508695471moz-txt-link-abbreviated" href="http://www.kamailioworld.com" target="_blank" moz-do-not-send="true">www.kamailioworld.com</a></pre>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
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    <pre class="moz-signature" cols="72">-- 
Daniel-Constantin Mierla
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio World Conference - May 14-16, 2018 - <a class="moz-txt-link-abbreviated" href="http://www.kamailioworld.com">www.kamailioworld.com</a></pre>
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