You actually called it? (Just as well it didn’t work. With the 3G shutdown, emergency services would be snowed under with people testing VoLTE.)
Just for laughs … what were you going to say if the call connected?
Sorry, it is a mystery to me as to why calling every number except 000/112 works with VoLTE.
Maybe all phones try to call emergency services on any network and it is choosing Telstra (where it is known that VoLTE is not yet working with the Librem 5). Maybe you could test that hypothesis if you can find a place where Telstra signal is poor or non-existent but Voda is strong?
Or maybe all phones try to call emergency services using some low-level “secret handshake” that the Librem 5’s modem hasn’t learnt about yet.
Ironically, if you could persuade the modem that 000 is not an emergency services call, maybe it would just work. (Does the emergency services call centre publish a regular phone number that will terminate there anyway i.e. that could be used instead of 000?)