Telephones don’t work that way. I used to work at a telco and if you think BGP is a joke wait till you lean about SS7. Anyone on the network can impersonate an

Telephones don’t work that way. I used to work at a telco and if you think BGP is a joke wait till you lean about SS7. Anyone on the network can impersonate anything they want, there is no such thing as “attestation”. Maybe things have changed in recent times but in years past we could port an arbitrary phone number with a few button clicks in a phone switch. The only security is that it’s all highly proprietary and a limited number of people have access to it