Problem is that in your config your serial forking route runs before looking into Kamailio location DB. So after first fork to [email protected] you need somehow to route call to part where Kamailio looks into location DB, in default config it is route(LOCATION). Something like this:
route[SERIAL]{
    $ru = "sip:[email protected]:5060";
    xlog("ALERT : new request uri $ru \n");
    t_on_failure("1");
    route(location);
}
Don’t forget to add route(location) to your config.
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solved how to make kamailio serial forking?