The local address is the one belonging to kamailio itself and it is taken from
Record-Route header. This avoids doing additional operations to figure out
outgoing network interface, when kamailio is listening on more than one socket.
Even it is not mandatory, the Contact header is not forbidden and the module
should not complain if incoming OPTIONS is without Contact. The topos module
requires to do record_route() to know those local addresses used for incoming
and outgoing.
If still some issue, reopen or better discuss on sr-users mailing list.
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