There is this article https://www.intraway.com/blog/provisioning-volte But it se...

		sega_sai on Feb 9, 2024 \| parent \| context \| favorite \| on: Google and a UK mobile operator cannot fix phone c... There is this article https://www.intraway.com/blog/provisioning-volte But it seems that basically VoLTE is not enabled by default and each side needs to white list the other. The provider needs to white list the phone and the phone needs some info about the provider. (But I don't fully understand it)

Thanks, that article helps too. As you say, it's a lot of security and identification.