Impossible to do Volte Call EM12G

Hello,
I have a problem with Quectel EM12G.
This is the version: EM12GPAR01A21M4G

When I try to do the following at command AT+QCFG=“ims” the result is ims,1,0 and I cannot try to use VoLTE also if the mobile using ims apn. Do you have some advices? What can I check?
If I try the sim in another mobile is it possible to do Volte call.
Thank you