Bench player intereferes

[Adam]

Mark,
I have called a Technical foul for a player entering the court illegal, even though neither my partner or I noticed it at the time. It was during a free throw and subs were coming in. The player in question merely ran in the direction of the bench before heading straight for the court. He never "reported" in; he never even made it to past his head coach. The table hit the buzzer and informed me that he had subbed in without reporting.

In hind sight, I'm wondering if this warranted a T. Must they report? Or must they be beckoned by the official?

Regardless, the table is capable of informing us of this infraction, are they not?