System and method for providing call origination information of restricted call termination in multi-number service

A method and a system for providing origination information of a reception-unavailable call in a multi number service are provided to supply the origination information for the reception-unavailable call if a receiving terminal is in a call unavailable state when a multi number service subscriber originates the call, and supply origination information of the unreceived call to the multi number service subscriber if the multi number service subscriber is in a call unavailable state. A transmitting party's MSC(Mobile Switching Center) receives an originated call, including a receiver phone number and an identification code showing a multi number service, from a transmitting terminal and requests a transmitting party's HLR(Home Location Register) to analyze the identification code(S201,S203). The transmitting MSC receives routing information transmitted from the transmitting party's HLR to an intelligent system, and routes the originated call to the intelligent system according to the received routing information(S207). The intelligent system changes a basic phone number, as a transmitter phone number included in the originated call, into an additional phone number of the transmitting terminal and processes the originated call to be received in a receiving terminal(S209). If the receiving party is in a call unavailable state, an origination information providing server produces an origination information message for the reception-unavailable call by using the additional phone number of the transmitting terminal as a transmitter phone number according to a request of the intelligent system(S221). After that, the origination information providing server transmits the message to the receiving terminal(S231).