Patent ID: 7702086

Claim:
A communication network comprising: a calling line and a called line, the calling line and the called line being at least one of a fixed network line and a mobile telephony line; a technical means for establishing a communication connection between the calling line and the called line; an accessing means for accessing a data line via which a first voice signal is at least partially transmitted between the calling line and the called line, the accessing means being configured to record the first voice signal transmitted by the calling line; a memory in which a reference data record is stored, the reference data record containing a reference voice sample of a person having access authorization to the calling line; a control unit having a voice recognition unit configured to access the memory for the stored reference data record, analyze the recorded first voice signal using voice recognition algorithms, and determine if the first voice signal belongs to the person having access authorization to the calling line by comparing the recorded first voice signal with the stored reference data record, the control unit configured to initiate production of an interrupt signal to interrupt the communication connection if the voice recognition unit determines that the first voice signal does not belong to the person having access authorization to the calling line; if the voice recognition unit determines that the first voice signal does belong to the person having access authorization to the calling line then the accessing means records a voice sample at regular time intervals during the entire communication connection, the voice recognition unit determining whether the voice sample belongs to a person having access authorization to at least one of the calling line and the called line.