"we now have to be in the business of maintaining a list of authorized CIDs we can send on a specific trunk line"
Yeah, that's what I was thinking. Similarly, some ISPs have implemented egress filtering to reduce abuse. At least a few speedbumps in the way of total anonymity over the phone would make scamming less trivial.
Yeah, that's what I was thinking. Similarly, some ISPs have implemented egress filtering to reduce abuse. At least a few speedbumps in the way of total anonymity over the phone would make scamming less trivial.