voicecall via LTE internal modem

I'm using Debian Bullseye on a Thinkpad T490s with FIBOCOM L830-EB-00 WWAN modem. I would like to know if it is possible to make voice calls with that modem. I was able to make a phone call with AT COMMANDS ATD + NUMBER; or answer ATA Tha user manual of the modem says that voice calls are allowed,

possible BUG: gnome freeze for a wile every some minutes

Hi, I'm having a problem after an update some weeks ago, every few minutes the pc is freezing for a while and after it recover, it seem to be the same as writte on this: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861294 I'm getting also the same errors: [50928.830285] GpuWatchdog[27129]: