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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