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Starting from LTE, there's no distinction in the network level between data and voice or SMS, it's all just IP traffic. The voice call protocol is called VoLTE.

Starting from LTE, there's no distinction in the network level between data and voice or SMS, it's all just IP traffic. The voice call protocol is called VoLTE. As long as your handset can reach the VoLTE infrastructure via IP, you can make and receive calls. This actually works already over WiFi too and that's called VoWiFi. That does not support handovers between networks though, so it is not that convenient. Specifically it means that if you walk outside the WiFI network, your call will drop. I suppose the different branding is due to this quality aspect, as there's no difference in the protocol.

ocean_id 5y ago
To have VoLTE or VoNR (the 5G version) the SIP based software handling your calls needs to interact directly with the software stack managed by the operator via a bunch of other telco protocols. I don't think you will be able to support "regular" calls/SMS without if it is not supported by amazon.
- taf2 5y ago
  looks like it might be possible? https://open5gs.org/open5gs/docs/tutorial/02-VoLTE-setup/ https://open5gs.org/open5gs/docs/tutorial/02-VoLTE-setup/