A digital false-proofing system for telephone

The utility model discloses a digital false-proofing system for telephone comprising a telephone, a telephone sound card, a database of recorded userinfo and a PC machine with digital encryption algorithm. The PC machine is connected with the telephone through the telephone sound card; when a user inquiries numbers, original numbers dialing from a keyboard of the telephone is sent to the PC machine for processing through the telephone sound card, and then the PC machine provides a processing result to the inquirer through the telephone sound card. The utility model is low in cost and easy to maintenance. A user establishes and manages digital false-proofing systems by oneself, thereby inquiring and checking timely and being strong in security and convenient in operation. The system can generate the original digits and the checking digits through two encryption algorithms; the group of encryption digits is characterized in double encryption. When the user inquires, the original digits are input through the keyboard of the telephone, and then the checking digits from the telephone sound card is checked with the checking digits on the mark, thereby being characterized by inquiring and checking timely.