Well this is certainly jurisdiction-dependent. e.g. the CRTC has policy 2018-484, Implementation of universal network-level blocking of calls with blatantly il

Well this is certainly jurisdiction-dependent. e.g. the CRTC has policy 2018-484, Implementation of universal network-level blocking of calls with blatantly illegitimate caller identification: https://crtc.gc.ca/eng/archive/2018/2018-484.htm https://crtc.gc.ca/eng/archive/2018/2018-484.htm CRTC gave telcos twelve months to implement, and it seems to have largely been implemented within that time frame.