You have to provide the SIP trace with all packets from INVITE to the BYE in order to see
the routing headers.
Also, it is more appropriate to use <sr-users [at] lists.sip-router.org> mailing
list for this kind of needs. The tracker here is intended mainly for bugs in the C code or
new feature requests, reaching a smaller group of people, the developers. On sr-users you
will get access to the wider community that deals with configuration files.
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/110#issuecomment-82616823