<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">Hi Daniel,<div><br></div><div>Thanks for your reply.</div><div>Yes, I'm using the topos module. When I tried to run without it I actually had more issue with the call flow not being able to even establish the call.</div><div><br></div><div>But your comment of not having both the both incoming and outgoing sip messages in the trace actually gave some additional clues and I was now able to fix the issue.</div><div>The problem happens because I was using "<span style="color:rgb(51,51,51);font-family:monospace;font-size:13.3333px;white-space:pre">fix_nated_contact()</span>" in the INVITE received from Teams.</div><div><br></div><div>With that the Contact header received in the INVITE as:<br>CONTACT: <sip:api-du-b-usea2.pstnhub.microsoft.com:443;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c><br>is forwarded as:<br>CONTACT: <sip:52.114.76.76:4672;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c><br></div><div><br></div><div>Which is then used to construct the BYE that is not accepted by Teams.</div><div><br></div><div>Removing that line fixes the issue.</div><div><br></div><div>Thanks again!</div><div><br></div><div><br></div></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Em ter., 27 de jul. de 2021 às 11:01, Daniel-Constantin Mierla <<a href="mailto:miconda@gmail.com">miconda@gmail.com</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
  
    
  
  <div>
    <p>Hello,</p>
    <p>are you using topos module?</p>
    <p>If yes, can you try without it and see if there is any
      difference?</p>
    <p>Also, the sip trace you pasted in the previous message does not
      have both incoming and outgoing sip messages -- having them is
      useful for troubleshooting.</p>
    <p>Cheers,<br>
      Daniel<br>
    </p>
    <div>On 23.07.21 22:16, João Vitor Arruda
      wrote:<br>
    </div>
    <blockquote type="cite">
      
      <div dir="ltr">
        <div dir="ltr">
          <div dir="ltr">
            <div dir="ltr">
              <div dir="ltr">Hello all,
                <div><br>
                </div>
                <div>I recently built an SBC to integrate Kamailio with
                  MS Teams following Henning Westerholt blob post and
                  all the other awesome tips I was able to find here in
                  the list.</div>
                <div><br>
                </div>
                <div>Everything is working great. The only missing
                  piece I would like some thoughts on is about why MS
                  Teams is not accepting the BYE sent from Kamailio. </div>
                <div>It eventually replies with "504 Server Time-out"</div>
                <div><br>
                </div>
                <div>The below trace shows the entire call.<br>
                </div>
                <div><br>
                </div>
                <div>
                  <div>||||||||||||||||||||</div>
                  <div>====================</div>
                  <div>tag: rcv</div>
                  <div>pid: 3381</div>
                  <div>process: 63</div>
                  <div>time: 1627070235.086307</div>
                  <div>date: Fri Jul 23 19:57:15 2021</div>
                  <div>proto: tls ipv4</div>
                  <div>srcip: 52.114.76.76</div>
                  <div>srcport: 4672</div>
                  <div>dstip: SBC_IP_ADDR</div>
                  <div>dstport: 5061</div>
                  <div>~~~~~~~~~~~~~~~~~~~~</div>
                  <div>INVITE
                    <a>sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone;transport=tls</a>
                    SIP/2.0</div>
                  <div>FROM: "Last, First
Name"<a><sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061;user=phone></a>;tag=bafa0f5a573749a7b494917c0309f544</div>
                  <div>TO:
                    <a><sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone></a></div>
                  <div>CSEQ: 1 INVITE</div>
                  <div>CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e</div>
                  <div>MAX-FORWARDS: 70</div>
                  <div>VIA: SIP/2.0/TLS
                    52.114.76.76:5061;branch=z9hG4bK60895c91</div>
                  <div>RECORD-ROUTE:
                    <a><sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr></a></div>
                  <div>CONTACT:
<a><sip:api-du-b-usea2.pstnhub.microsoft.com:443;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c></a></div>
                  <div>CONTENT-LENGTH: 1103</div>
                  <div>MIN-SE: 300</div>
                  <div>SUPPORTED: timer</div>
                  <div>USER-AGENT: Microsoft.PSTNHub.SIPProxy
                    v.2021.6.15.17 i.EUNO.0</div>
                  <div>CONTENT-TYPE: application/sdp</div>
                  <div>ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY</div>
                  <div>PRIVACY: id</div>
                  <div>SESSION-EXPIRES: 3600</div>
                  <div><br>
                  </div>
                  <div>v=0</div>
                  <div>o=- 599625 0 IN IP4 127.0.0.1</div>
                  <div>s=session</div>
                  <div>c=IN IP4 52.113.58.181</div>
                  <div>b=CT:10000000</div>
                  <div>t=0 0</div>
                  <div>m=audio 50122 RTP/SAVP 104 9 103 111 18 0 8 97
                    101 13 118</div>
                  <div>c=IN IP4 52.113.58.181</div>
                  <div>a=rtcp:50123</div>
                  <div>a=ice-ufrag:fTy/</div>
                  <div>a=ice-pwd:tQKGN0Szi7Q/vTdf6SiXUSpj</div>
                  <div>a=rtcp-mux</div>
                  <div>a=candidate:1 1 UDP 2130706431 52.113.58.181
                    50122 typ srflx raddr 10.0.33.230 rport 50122</div>
                  <div>a=candidate:1 2 UDP 2130705918 52.113.58.181
                    50123 typ srflx raddr 10.0.33.230 rport 50123</div>
                  <div>a=candidate:2 1 tcp-act 2121006078 52.113.58.181
                    49152 typ srflx raddr 10.0.33.230 rport 49152</div>
                  <div>a=candidate:2 2 tcp-act 2121006078 52.113.58.181
                    49152 typ srflx raddr 10.0.33.230 rport 49152</div>
                  <div>a=label:main-audio</div>
                  <div>a=mid:1</div>
                  <div>a=crypto:1 AES_CM_128_HMAC_SHA1_80
                    inline:PC00Mgk39GjTYJ+mUSNQg++TU6zJKar4VYDj4/ET|2^31</div>
                  <div>a=sendrecv</div>
                  <div>a=rtpmap:104 SILK/16000</div>
                  <div>a=rtpmap:9 G722/8000</div>
                  <div>a=rtpmap:103 SILK/8000</div>
                  <div>a=rtpmap:111 SIREN/16000</div>
                  <div>a=fmtp:111 bitrate=16000</div>
                  <div>a=rtpmap:18 G729/8000</div>
                  <div>a=fmtp:18 annexb=no</div>
                  <div>a=rtpmap:0 PCMU/8000</div>
                  <div>a=rtpmap:8 PCMA/8000</div>
                  <div>a=rtpmap:97 RED/8000</div>
                  <div>a=rtpmap:101 telephone-event/8000</div>
                  <div>a=fmtp:101 0-16</div>
                  <div>a=rtpmap:13 CN/8000</div>
                  <div>a=rtpmap:118 CN/16000</div>
                  <div>a=ptime:20</div>
                  <div>||||||||||||||||||||</div>
                  <div>====================</div>
                  <div>tag: snd</div>
                  <div>pid: 3381</div>
                  <div>process: 63</div>
                  <div>time: 1627070235.089106</div>
                  <div>date: Fri Jul 23 19:57:15 2021</div>
                  <div>proto: tls ipv4</div>
                  <div>srcip: SBC_IP_ADDR</div>
                  <div>srcport: 5061</div>
                  <div>dstip: 52.114.76.76</div>
                  <div>dstport: 4672</div>
                  <div>~~~~~~~~~~~~~~~~~~~~</div>
                  <div>SIP/2.0 100 trying -- your call is important to
                    us</div>
                  <div>FROM: "Last, First
Name"<a><sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061;user=phone></a>;tag=bafa0f5a573749a7b494917c0309f544</div>
                  <div>TO:
                    <a><sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone></a></div>
                  <div>CSEQ: 1 INVITE</div>
                  <div>CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e</div>
                  <div>VIA: SIP/2.0/TLS
                    52.114.76.76:5061;branch=z9hG4bK60895c91;rport=4672</div>
                  <div>Server: kamailio (5.3.7 (x86_64/linux))</div>
                  <div>Content-Length: 0</div>
                  <div><br>
                  </div>
                  <div>||||||||||||||||||||</div>
                  <div>====================</div>
                  <div>tag: snd</div>
                  <div>pid: 3291</div>
                  <div>process: 18</div>
                  <div>time: 1627070235.111825</div>
                  <div>date: Fri Jul 23 19:57:15 2021</div>
                  <div>proto: tls ipv4</div>
                  <div>srcip: SBC_IP_ADDR</div>
                  <div>srcport: 5061</div>
                  <div>dstip: 52.114.76.76</div>
                  <div>dstport: 4672</div>
                  <div>~~~~~~~~~~~~~~~~~~~~</div>
                  <div>SIP/2.0 180 Ringing</div>
                  <div>FROM: "Last, First
Name"<a><sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061;user=phone></a>;tag=bafa0f5a573749a7b494917c0309f544</div>
                  <div>t:<a><sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone></a>;tag=e55N8paBUgZac</div>
                  <div>CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e</div>
                  <div>CSEQ: 1 INVITE</div>
                  <div>m:<a><sip:+5515XXXXXXXXX@192.168.1.254:5060;transport=udp></a></div>
                  <div>User-Agent:FreeSWITCH-mod_sofia/1.10.3-release~64bit</div>
                  <div>Accept:application/sdp</div>
                  <div>Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY</div>
                  <div>k:path,replaces</div>
                  <div>u:talk,hold,conference,refer</div>
                  <div>l:0</div>
                  <div>Via: SIP/2.0/TLS
                    52.114.76.76:5061;rport=4672;branch=z9hG4bK60895c91</div>
                  <div>Record-Route:
<a><sip:192.168.1.253:5060;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on></a>,<a><sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on></a></div>
                  <div>Record-Route:
                    <a><sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr></a></div>
                  <div>P-SR-XBranch:
                    z9hG4bKe7d4.5ae277881edb9c04a7ac65af016e582e.0</div>
                  <div><br>
                  </div>
                  <div>||||||||||||||||||||</div>
                  <div>====================</div>
                  <div>tag: snd</div>
                  <div>pid: 3298</div>
                  <div>process: 21</div>
                  <div>time: 1627070245.043621</div>
                  <div>date: Fri Jul 23 19:57:25 2021</div>
                  <div>proto: tls ipv4</div>
                  <div>srcip: SBC_IP_ADDR</div>
                  <div>srcport: 5061</div>
                  <div>dstip: 52.114.76.76</div>
                  <div>dstport: 4672</div>
                  <div>~~~~~~~~~~~~~~~~~~~~</div>
                  <div>SIP/2.0 183 Session Progress</div>
                  <div>FROM: "Last, First
Name"<a><sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061;user=phone></a>;tag=bafa0f5a573749a7b494917c0309f544</div>
                  <div>t:<a><sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone></a>;tag=e55N8paBUgZac</div>
                  <div>CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e</div>
                  <div>CSEQ: 1 INVITE</div>
                  <div>m:<a><sip:+5515XXXXXXXXX@192.168.1.254:5060;transport=udp></a></div>
                  <div>User-Agent:FreeSWITCH-mod_sofia/1.10.3-release~64bit</div>
                  <div>Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY</div>
                  <div>k:path,replaces</div>
                  <div>u:talk,hold,conference,refer</div>
                  <div>c:application/sdp</div>
                  <div>Content-Disposition:session</div>
                  <div>l:323</div>
                  <div>Via: SIP/2.0/TLS
                    52.114.76.76:5061;rport=4672;branch=z9hG4bK60895c91</div>
                  <div>Record-Route:
<a><sip:192.168.1.253:5060;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on></a>,<a><sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on></a></div>
                  <div>Record-Route:
                    <a><sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr></a></div>
                  <div>P-SR-XBranch:
                    z9hG4bKe7d4.5ae277881edb9c04a7ac65af016e582e.0</div>
                  <div><br>
                  </div>
                  <div>v=0</div>
                  <div>o=FreeSWITCH 1627045233 1627045234 IN IP4
                    SBC_IP_ADDR</div>
                  <div>s=FreeSWITCH</div>
                  <div>c=IN IP4 SBC_IP_ADDR</div>
                  <div>t=0 0</div>
                  <div>m=audio 49692 RTP/SAVP 0 101</div>
                  <div>a=rtpmap:0 PCMU/8000</div>
                  <div>a=rtpmap:101 telephone-event/8000</div>
                  <div>a=fmtp:101 0-16</div>
                  <div>a=ptime:20</div>
                  <div>a=crypto:1 AES_CM_128_HMAC_SHA1_80
                    inline:eMGqj0jubamtvLsI/E/YSj8UqNKgUB5DTHGWc7PY</div>
                  <div>a=nortpproxy:yes</div>
                  <div><br>
                  </div>
                  <div>||||||||||||||||||||</div>
                  <div>====================</div>
                  <div>tag: snd</div>
                  <div>pid: 3293</div>
                  <div>process: 19</div>
                  <div>time: 1627070255.938770</div>
                  <div>date: Fri Jul 23 19:57:35 2021</div>
                  <div>proto: tls ipv4</div>
                  <div>srcip: SBC_IP_ADDR</div>
                  <div>srcport: 5061</div>
                  <div>dstip: 52.114.76.76</div>
                  <div>dstport: 4672</div>
                  <div>~~~~~~~~~~~~~~~~~~~~</div>
                  <div>SIP/2.0 200 OK</div>
                  <div>FROM: "Last, First
Name"<a><sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061;user=phone></a>;tag=bafa0f5a573749a7b494917c0309f544</div>
                  <div>t:<a><sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone></a>;tag=e55N8paBUgZac</div>
                  <div>CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e</div>
                  <div>CSEQ: 1 INVITE</div>
                  <div>m:<a><sip:+5515XXXXXXXXX@192.168.1.254:5060;transport=udp></a></div>
                  <div>User-Agent:FreeSWITCH-mod_sofia/1.10.3-release~64bit</div>
                  <div>Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY</div>
                  <div>k:path,replaces</div>
                  <div>u:talk,hold,conference,refer</div>
                  <div>c:application/sdp</div>
                  <div>Content-Disposition:session</div>
                  <div>l:323</div>
                  <div>Via: SIP/2.0/TLS
                    52.114.76.76:5061;rport=4672;branch=z9hG4bK60895c91</div>
                  <div>Record-Route:
<a><sip:192.168.1.253:5060;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on></a>,<a><sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on></a></div>
                  <div>Record-Route:
                    <a><sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr></a></div>
                  <div>P-SR-XBranch:
                    z9hG4bKe7d4.5ae277881edb9c04a7ac65af016e582e.0</div>
                  <div><br>
                  </div>
                  <div>v=0</div>
                  <div>o=FreeSWITCH 1627045233 1627045234 IN IP4
                    SBC_IP_ADDR</div>
                  <div>s=FreeSWITCH</div>
                  <div>c=IN IP4 SBC_IP_ADDR</div>
                  <div>t=0 0</div>
                  <div>m=audio 49692 RTP/SAVP 0 101</div>
                  <div>a=rtpmap:0 PCMU/8000</div>
                  <div>a=rtpmap:101 telephone-event/8000</div>
                  <div>a=fmtp:101 0-16</div>
                  <div>a=ptime:20</div>
                  <div>a=crypto:1 AES_CM_128_HMAC_SHA1_80
                    inline:eMGqj0jubamtvLsI/E/YSj8UqNKgUB5DTHGWc7PY</div>
                  <div>a=nortpproxy:yes</div>
                  <div><br>
                  </div>
                  <div>||||||||||||||||||||</div>
                  <div>====================</div>
                  <div>tag: rcv</div>
                  <div>pid: 3370</div>
                  <div>process: 57</div>
                  <div>time: 1627070255.957735</div>
                  <div>date: Fri Jul 23 19:57:35 2021</div>
                  <div>proto: tls ipv4</div>
                  <div>srcip: 52.114.76.76</div>
                  <div>srcport: 4672</div>
                  <div>dstip: SBC_IP_ADDR</div>
                  <div>dstport: 5061</div>
                  <div>~~~~~~~~~~~~~~~~~~~~</div>
                  <div>ACK
                    <a>sip:+5515XXXXXXXXX@192.168.1.254:5060;transport=udp</a>
                    SIP/2.0</div>
                  <div>FROM: "Last, First
Name"<a><sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061;user=phone></a>;tag=bafa0f5a573749a7b494917c0309f544</div>
                  <div>TO:
                    <a><sip:+5515XXXXXXXXX@SBC-FQDN:5061></a>;user=phone;tag=e55N8paBUgZac</div>
                  <div>CSEQ: 1 ACK</div>
                  <div>CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e</div>
                  <div>MAX-FORWARDS: 70</div>
                  <div>VIA: SIP/2.0/TLS
                    52.114.76.76:5061;branch=z9hG4bKe3747d68</div>
                  <div>CONTACT:
<a><sip:api-du-b-usea2.pstnhub.microsoft.com:443;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c></a></div>
                  <div>CONTENT-LENGTH: 0</div>
                  <div>USER-AGENT: Microsoft.PSTNHub.SIPProxy
                    v.2021.6.15.17 i.EUNO.0</div>
                  <div>ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY</div>
                  <div>Route:
<a><sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on></a></div>
                  <div>Route:
<a><sip:192.168.1.253:5060;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on></a></div>
                  <div>P-SR-XUID: atpsh-60fb1b5d-d35-1</div>
                  <div><br>
                  </div>
                  <div>||||||||||||||||||||</div>
                  <div>====================</div>
                  <div>tag: snd</div>
                  <div>pid: 3302</div>
                  <div>process: 23</div>
                  <div>time: 1627070275.228363</div>
                  <div>date: Fri Jul 23 19:57:55 2021</div>
                  <div>proto: tls ipv4</div>
                  <div>srcip: SBC_IP_ADDR</div>
                  <div>srcport: 5061</div>
                  <div>dstip: 52.114.75.24</div>
                  <div>dstport: 5061</div>
                  <div>~~~~~~~~~~~~~~~~~~~~</div>
                  <div>BYE
<a>sip:52.114.76.76:4672;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c</a>
                    SIP/2.0</div>
                  <div>Record-Route:
                    <a><sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=e55N8paBUgZac;lr=on></a></div>
                  <div>Record-Route:
                    <a><sip:192.168.1.253:5060;r2=on;ftag=e55N8paBUgZac;lr=on></a></div>
                  <div>Via: SIP/2.0/TLS
                    SBC_IP_ADDR:5061;branch=z9hG4bK92fc.fcb147cf8e5e6e6e960d0f2401ad6383.0</div>
                  <div>v:SIP/2.0/UDP
192.168.1.254;received=192.168.1.254;rport=5060;branch=z9hG4bKgvXrQrcNjNj3m</div>
                  <div>f:<a><sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone></a>;tag=e55N8paBUgZac</div>
                  <div>t:"Last, First
Name"<a><sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061;user=phone></a>;tag=bafa0f5a573749a7b494917c0309f544</div>
                  <div>i:c9b2aa4f658f5788aa7090bef0f5e35e</div>
                  <div>CSeq:38981345 BYE</div>
                  <div>User-Agent:FreeSWITCH-mod_sofia/1.10.3-release~64bit</div>
                  <div>Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY</div>
                  <div>k:path,replaces</div>
                  <div>Reason:Q.850;cause=16;text="NORMAL_CLEARING"</div>
                  <div>Max-Forwards: 64</div>
                  <div>l:0</div>
                  <div>Route:
                    <a><sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr></a></div>
                  <div>P-SR-XUID: atpsh-60fb1b5d-d35-1</div>
                  <div><br>
                  </div>
                  <div>||||||||||||||||||||</div>
                  <div>====================</div>
                  <div>tag: rcv</div>
                  <div>pid: 3385</div>
                  <div>process: 65</div>
                  <div>time: 1627070300.423499</div>
                  <div>date: Fri Jul 23 19:58:20 2021</div>
                  <div>proto: tls ipv4</div>
                  <div>srcip: 52.114.75.24</div>
                  <div>srcport: 5061</div>
                  <div>dstip: SBC_IP_ADDR</div>
                  <div>dstport: 5061</div>
                  <div>~~~~~~~~~~~~~~~~~~~~</div>
                  <div>SIP/2.0 504 Server Time-out</div>
                  <div>FROM:
                    <a><sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone></a>;tag=e55N8paBUgZac</div>
                  <div>TO: "Last, First
Name"<a><sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061;user=phone></a>;tag=bafa0f5a573749a7b494917c0309f544</div>
                  <div>CSEQ: 38981345 BYE</div>
                  <div>CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e</div>
                  <div>VIA: SIP/2.0/TLS
                    SBC_IP_ADDR:5061;branch=z9hG4bK92fc.fcb147cf8e5e6e6e960d0f2401ad6383.0</div>
                  <div>CONTENT-LENGTH: 0</div>
                  <div>ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY</div>
                  <div>SERVER: Microsoft.PSTNHub.SIPProxy v.2021.6.15.17
                    i.EUWE.3</div>
                  <div>Via: SIP/2.0/UDP
192.168.1.254;received=192.168.1.254;rport=5060;branch=z9hG4bKgvXrQrcNjNj3m</div>
                  <div>Record-Route:
<a><sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=e55N8paBUgZac;lr=on></a>,<a><sip:192.168.1.253:5060;r2=on;ftag=e55N8paBUgZac;lr=on></a></div>
                  <div>P-SR-XBranch:
                    z9hG4bK92fc.fcb147cf8e5e6e6e960d0f2401ad6383.0</div>
                </div>
                <div><br>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
      <br>
      <fieldset></fieldset>
      <pre>__________________________________________________________
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</pre>
    </blockquote>
    <pre cols="72">-- 
Daniel-Constantin Mierla -- <a href="http://www.asipto.com" target="_blank">www.asipto.com</a>
<a href="http://www.twitter.com/miconda" target="_blank">www.twitter.com/miconda</a> -- <a href="http://www.linkedin.com/in/miconda" target="_blank">www.linkedin.com/in/miconda</a></pre>
  </div>

</blockquote></div>