Sounds like a good first step to solve the problem of how the legacy telecoms systems were designed in a world of trusted peers federating. End result of course

Sounds like a good first step to solve the problem of how the legacy telecoms systems were designed in a world of trusted peers federating. End result of course being spoofed caller ID spam. Unless I'm missing something though, these measures don't do anything to address the gaping security hole in mobile networks around roaming interconnects. That seems to still be a pretty good way to do SMS and call interception, which are increasingly valuable as phones become the de-facto 2FA channel for access to banking, cryptocurrency services and more.