| Australia | Australian Communications and Media Authority (ACMA) / Code C661:2022 | Requires carriers to track and block spoofed local CLIs and unregistered international originations. |
| Belgium | Royal Decree | Requires operators to block inbound international calls spoofing Belgian numbers. |
| China | National Policy / MIIT | Prohibits internationally originated calls from presenting a local national CLI. |
| Czech Republic | Czech Telecommunication Office (CTU) | Mandates operators to block incoming international traffic spoofing domestic numbers. |
| France | Regulatory Authority for Electronic Communications, Postal Services and Print Media Distribution (ARCEP) | Disallows international transit traffic displaying a French CLI. |
| Germany | Bundesnetzagentur | Mandates hiding German caller ID information for calls originating outside Germany (excluding valid roaming). Calls will appear as private/anonymous. |
| India | Telecom Regulatory Authority of India (TRAI) | Requires local telecom operators to use specialized detection systems to intercept and drop overseas calls with In-Country CLI. |
| Ireland | Nuisance Communications Industry Taskforce (NCIT) | Irish networks must block all incoming traffic coming from outside Ireland that carries an Irish number as the Caller ID. |
| Israel | Ministry of Communications (MoC) | Blocks foreign-originated calls spoofing Israeli landline and mobile numbers (excluding verified roaming). |
| Malaysia | Malaysian Communications and Multimedia Commission (MCMC) | Enforces blocking of international calls attempting to present a local national CLI. |
| Malta | Malta Communications Authority (MCA) | Requires network operators to block inbound international calls spoofing local numbers. |
| Poland | Office of Electronic Communications (UKE) | Mandates telecommunication service providers to detect and block calls spoofing national numbers. |
| Romania | National Authority for Management and Regulation in Communications (ANCOM) | Mandated local telecom operators to block calls from outside the country that display Romanian National numbers as the Caller ID. June 2025 |
| Singapore | Infocomm Media Development Authority (IMDA) | Blocks international incoming calls where the caller ID is falsified with a local (+65) prefix. |
| Spain | Ministry for Digital Transformation | Mandates blocking international calls that attempt to present a Spanish CLI. |
| Sweden | Post- och telestyrelsen (PTS) | Enforces inbound international CLI blocking through national guidelines. |
| Switzerland | OFCOM/BAKOM | Enforces tracking and blocking requirements for spoofed inbound international calls. |
| Turkey | Information and Communication Technologies Authority (BTK) | Prohibits foreign-originated calls from presenting local national CLI caller IDs. |
| United Kingdom | Ofcom | Requires network operators to block calls from abroad displaying UK presentation numbers. |
