You can try to use 'tcpdump -s 0 ...' to see what comes there. Beware that tcp is
a stream protocol and network sniffing tools can see parts of the same messages coming as
separate packet on the wire, which can be a matter of how the kernel flushes the
outbuffer.
Also, don't forget about the option with onsend_route to see what kamailio is writting
to the socket.
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/51#issuecomment-73687767