I’m also hazarding a guess and stating that any newly gate in ship that doesn’t squawk its ident and intentions within, at most, a few minutes from showing up is going to receive a series of requests for same with gradually but steadily increasing urgency and declining civility, escalating smoothly from local Traffic Control to the System Navy.
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It varies between systems. The examples we see here are in highly developed core systems, which maintain procedural control over everything inside the system limit.
Less developed systems tend to maintain lesser degrees of control depending on what, well, they can afford. Earth-today, for example, might reasonably maintain positive control over everything within the local sovereignty zone (12 planetary diameters) and procedural control over within-the-orbit-of-Luna, while some small outposts in otherwise uninhabited systems go all the way down to “Yeah, yeah, pick a pad near the beacon, One-Niner, and try not to hit anything expensive on the way down, 'kay?”
(Also - in Imperial volumes - if they’re not responding, the escalation will be to the Stellar Guard, not the system picket. In civilized space, the odds of a vessel in distress or a tragically overconfident smuggler are vastly greater than that of anything military; and also, military vessels tend to be painfully obvious.)