To make calls in the 4G/LTE network, the SIM card and the provider must offer the VoLTE service. Without VoLTE, the 2G or 3G network is used for making calls. Therefore, the 4G/LTE network should only be activated if the service is available. Otherwise, the device will show 4G reception, but will fall back to the 2G or 3G network for making calls.

Connect the VoLTE enabler to the EXT socket on the gateway or nano.

The configuration is done automatically. The status LED will light up red, then green.
After 2-3 seconds, the process is complete and LTE / VoLTE is activated. The APN is also set, so that the LTE module is prepared for the use of Internet accessories.