iCall HandlerPerpetual: How to activate it?

Hi guys,

I have created an iCall with a Handler Perpetual, however it is not activated at any moment at all.

sys icall handler perpetual intif_copy_log_trace {
script intif_copy_log_trace
subscriptions {
    intif_copy_log_trace {
        event-name intif_copy_log_trace
    }
}

} Code