User apparatus for receiving voice calls and messages, said user apparatus being associated with a called line number and comprising: - input/output means for interacting with a user, - transceiving means for communicating with a communication network, - memory means for storing data, - processing means in communication with said input/output means, said transceiving means, and said memory means, wherein said processing means are configured for: - receiving from said communication network, through said transceiving means, a call setup message comprising a user-user information element, said user-user information element comprising a user-user information field, - extracting the content of said user-user information field, the content of said user-user information field being configured to comprise an alert information, and - outputting audio and/or video alerting signals and information, through said input/output means, according to the content of said user-user information field, characterized in that said alert information is further configured to comprise at least one personal datum of a caller and said call setup message is further configured to comprise a calling line number, and wherein: - said memory means are configured to comprise a personal data table in which at least one personal datum is associated with said calling line number and - said processing means are also configured for: • extracting said calling line number from said call setup message, • checking said at least one personal datum of the caller, contained in said user-user information field, against the data contained in said personal data table and • outputting the result of said personal data check through said input/output means. - input/output means for interacting with a user, - transceiving means for communicating with a communication network, - memory means for storing data, - processing means in communication with said input/output means, said transceiving means, and said memory means, - receiving from said communication network, through said transceiving means, a call setup message comprising a user-user information element, said user-user information element comprising a user-user information field, - extracting the content of said user-user information field, the content of said user-user information field being configured to comprise an alert information, and - outputting audio and/or video alerting signals and information, through said input/output means, according to the content of said user-user information field, - said memory means are configured to comprise a personal data table in which at least one personal datum is associated with said calling line number and - said processing means are also configured for: • extracting said calling line number from said call setup message, • checking said at least one personal datum of the caller, contained in said user-user information field, against the data contained in said personal data table and • outputting the result of said personal data check through said input/output means. • extracting said calling line number from said call setup message, • checking said at least one personal datum of the caller, contained in said user-user information field, against the data contained in said personal data table and • outputting the result of said personal data check through said input/output means.