I don't know. But since Etrali and Nice have a strong partnership, I guess that, if version 33 is not supported yet, it is going to be soon. (I haven't found anything on Etrali's website).
BTW, if 33 is a newest version of Etrali's PBX, then it is going to be supported from Nice's version 8.8, but probably not from earlier versions... We'll see.