Telit VoLTE Call

I’m a newbie regarding the subject of IoT device and AT command. I’m wondering if there is a way to force the module to never perform a csfallback for a voice call. currently I tried to use CEMODE=0 and 3, the first call is a VoLTE call, the second, is sent through CS domain. do you have an idea how to force the module to use only the LTE network.

For VoLTE call, is there a way in Telit module to disable the sip precondition?