I had made my call to a MATZ but getting no reply i transmitted my intentions and did them anyway
I didn't go into the ATZ, so Im safe! Seriously though there must be some standard as to what you can do with the RT when you're in such a situation. One time after the flight I mentioned before, I was pleasantly surprised to hear another ground station take over the MATZ frequency even though I'd already transmitted
so there must be some sort of rule