As Daniel already replied you, SIP replies are handled in reply routes
based on Via.
You are posting a request route snippet which doesn't handle at all replies.
Please do what has been asked to you, write on the users mailing list and
there people will tell you if it is a bug or not.

On Thu, Apr 2, 2020 at 1:57 PM jpVm5jYYRE1VIKL <notifications@github.com>
wrote:

> Issue i reported is about that kamailio don`t relay 404 from upstream on
> 1st REGISTER.
>
> route[FORWARD]
> {
> t_on_failure("FAILROUTE");
> if(!t_relay())
> {
> sl_reply_error();
> }
>
> drop;
> }
>
>
> Have exactly same behavior reported. I still sure that this is a bug.
>
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