Just for my understanding and better situational awareness was it something like this:
00:00:00 A/C just airborne
00:00:30 ATCO: triple X, climb to FL 170 report passing 6000
00:00:35 pilot: passing 6000 _____ <== so: omitting to acknowledge the most important element safety wise; no callsign
00:00:38 ATCO: ??? ______________ <== ATCO being puzzled
not 00:00:35 but 00:00:31
Exactly, without call sign, without cleared level, it sounds like it has already passed inter level ,
and happened regularly these days( and I did numerous corrections but now I believe that something has been changed in pilot training without informing ATC system )
that is the reason for posting on these pages. And I thought that it was more appropriate here rather than ATC chapter.