Kamailio will return 478 if it can not resolve the destination e.g. by DNS. Please check
your routing script that you end up with a proper request URI that contains a
hostname/domain part (or set $du etc..) that Kamailio can route the request accordingly.
Please discuss the details of your issue on the sr-users list, as the issues are used for
tracking issues in the code or more concrete feature requests.
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