Make sure LTE is started:
$ systemctl status lte
● lte.service - Amarisoft LTE
Loaded: loaded (/lib/systemd/system/lte.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2022-01-06 08:42:45 UTC; 26min ago
Main PID: 589 (bash)
Tasks: 3 (limit: 4464)
Memory: 12.2M
CGroup: /system.slice/lte.service
├─ 589 /bin/bash /root/ots/ltestart.sh
├─ 763 /bin/bash /root/ots/ltestart.sh
└─17415 sleep 10
Jan 06 08:42:45 ORSx systemd[1]: Started Amarisoft LTE.