The development of this project stems from the need to strengthen measures to prevent and combat CLI spoofing (falsification of the calling line identifier), which is widely used in telephone fraud and social engineering attacks. The rise of this phenomenon has underscored the need to implement advanced technical mechanisms that verify the authenticity of phone numbers used in international calls.
As part of this project, ARCOM proposes the creation of an interoperable mechanism based on the number verification API standard developed as part of the GSMA Open Gateway international initiative, which introduces the concept of Silent Network Authentication for the first time. The tool will enable service providers and telecommunications networks to verify in real time whether the phone number used in a call actually belongs to the claimed subscriber and whether the subscriber is roaming. Thanks to the automated exchange of information between providers, networks will be able to detect and block international calls that fraudulently use fake national numbers before they even reach end users.
The public consultation on this draft will continue until July 22, 2026, which is the deadline for submitting recommendations on the draft.
