The present invention relates to Internet-based pre-verification system of the phone-based authentication services, and Internet dial the user terminal is the first terminal; A Web server that is accessible through the transactions certification interface to move to the required site with respect to the first terminal; An authentication server that performs authentication for electronic commerce via the web server to be requested from the first terminal; It is connected to the authentication server, the host server for processing electronic transactions being requested from the first terminal; Computer telephone integration that is called through the telephone network are implemented in (CTI, computer and telephony integration) and the ARS, being connected to the second terminal of the electronic transaction is a request of the first terminal users authorized to the electronic transaction, the authentication according to the grant providing a verification code received by it, and comprises a call server making a phone authentication to provide authentication completion information based on the verification to the host server, thereby having the effect of increasing the integrity of the electronic transactions and verification.
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