Difference in Bearer Assignment between Normal and Emergency VoLTE calls: AA-Request only triggered in Emergency Calls

Hi everyone.

I saw some tests in the lab that when I make a normal VoLTE voice call the dedicated bearer is not assigned, while if I make an emergency VoLTE voice call it is.

From the logs I saw that only in emergency calls I get the AA-Request while, I do not receive it on normal VoLTE calls.

What could be the cause?