Even with LTE/VoLTE, the voice packets are usually contained within the telco private network, that just happen to be IP based, with private interconnections to

Even with LTE/VoLTE, the voice packets are usually contained within the telco private network, that just happen to be IP based, with private interconnections to the other telcos. At some point we might see most of the VoIP being transported across the internet as well, but that'll be the far future.