Patent ID: 8600367

Claim:
A hands-free telephone device of a motor vehicle, comprising: a communication interface operatively configured to connect at least first and second mobile telephones to the hands-free telephone device of the motor vehicle; a control unit operatively configured to control a transfer of mobile telephone address book entries from the first and second mobile telephones to the hands-free telephone device of the motor vehicle via the communication interface; and a common address book configured by the hands-free telephone device of the motor vehicle, the common address book containing entries generated based on the mobile telephone address book entries from the first and second mobile telephones, wherein each of mobile telephone address book entries received from the first and second mobile telephones is assigned an identity tag received from and identifying a corresponding one of the first and second mobile telephones from which each such entry originated, and wherein the identity tag identifying said corresponding one of the first and second mobile telephones is stored together with each of the corresponding mobile telephone address book entries in a memory unit of the hands-free telephone device of the motor vehicle.