METHOD FOR ALARMING CALL POSSIBILITY AND SYSTEM THEREOF

A method for informing a call-available state and a system for performing the method are provided to transmit a message for informing that the telephone conversation is possible through a virtual number, afterward in case a caller sends a call signal to the virtual number of a callee, and the telephone conversation with the callee is impossible. A receiver(710) receives the actual phone number of a caller, the actual phone number of a callee and a number discriminating variable from a home location register, and then transmits them to a number discriminating unit(720). The number discriminating unit analyzes the number discriminating variable to confirm the actual phone number or virtual number to which the caller sends a call signal. A searcher(730) searches an actual number and virtual number mapping database(740) based on the actual phone number of the callee, extracts the virtual number mapped to the actual phone number, and then transmits the extracted virtual number and the actual phone number of the caller to a message generating unit(750).