Until there is a regulation requiring stir & shaken to be implemented, you won't be able to trust your caller ID. Most of the telecom industry is stuck on legac

Until there is a regulation requiring stir & shaken to be implemented, you won't be able to trust your caller ID. Most of the telecom industry is stuck on legacy tech stacks that they actively resist upgrading, thus why calls are slung bareback over the web with no encryption on the metadata or the audio stream for nearly all providers.