<h3>Description</h3>
<p>Please check attached pcap.<br>
<a href="https://github.com/kamailio/kamailio/files/3688791/siptrace.pcap.gz">siptrace.pcap.gz</a></p>
<p>Kamailio send INVITE (packet 1) from port <code>TCP/42394</code>.<br>
SIP trace encapsulate INVITE (packet 2) and encodes Kamailio source port <code>TCP/5060</code></p>
<h4>Debugging Data</h4>
<p>HEP header parsed by lua <a href="https://github.com/sipcapture/hep-wireshark">disector</a></p>
<pre><code>HEP3 Protocol
    HEP ID: HEP3
    Length (Bytes): 1574
    Protocol family: IPv4
    Protocol ID: TCP
    Source IPv4 address: 172.21.0.131
    Destination IPv4 address: 192.168.57.11
    Source port: 5060
    Destination port: 5060
    Timestamp: 1570150645
    Timestamp us: 740165
    Protocol Type: SIP
    Capture ID: 1
    Payload [truncated]: INVITE sip:911@192.168.57.11;transport=tcp SIP/2.0\r\nRecord-Route: <sip:172.21.0.131;transport=tcp;lr=on;ftag=KvNj7jXrmK89p>\r\nVia: SIP/2.0/TCP 172.21.0.131;branch=z9hG4bK7c2d.2d8104273b7063309f5694ac963c9ad8.0;i=21
</code></pre>
<p><a href="https://github.com/sipcapture/HEP/blob/master/docs/HEP3_Network_Protocol_Specification_REV_30.pdf">HEP format description located here</a>.</p>
<h3>Additional Information</h3>
<ul>
<li><strong>Kamailio Version</strong> - output of <code>kamailio -v</code></li>
</ul>
<pre><code>/ # kamailio -v
version: kamailio 5.1.6 (x86_64/linux) 
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144 MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown 
compiled on 11:01:40 Oct  4 2018 with gcc 6.4.0
</code></pre>
<ul>
<li><strong>Operating System</strong>:<br>
Docker container<br>
Userland</li>
</ul>
<pre><code>/ # cat /etc/os-release 
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.8.1
PRETTY_NAME="Alpine Linux v3.8"
HOME_URL="http://alpinelinux.org"
BUG_REPORT_URL="http://bugs.alpinelinux.org"
</code></pre>
<p>Kernel Amazon Linux 2</p>
<pre><code>/ # uname -a
Linux proxy-dc0-0 4.14.128-112.105.amzn2.x86_64 #1 SMP Wed Jun 19 16:53:40 UTC 2019 x86_64 Linux
</code></pre>

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