so I do this:

request_route {

    if (is_method("INVITE") && !has_totag()) {

        $dlg_var(is_init_invite) = "1";

    }

}

onreply_route {

    xlog("L_INFO","[$rs-$rr][is_init_invite:$dlg_var(is_init_invite)]");

    if (is_method("INVITE") && t_check_status("200") && $dlg_var(is_init_invite) == "1") {

        # do somting

        $dlg_var(is_init_invite) = "0";

    }

    xlog("L_INFO","[$rs-$rr][is_init_invite:$dlg_var(is_init_invite)]");

}

What I confuse is：

When I recive 100 Trying LOG is

[100 - Trying][is_init_invite:0]

[100 - Trying][is_init_invite:1]

why is_init_invite is 0?