Abstract: A method for maintaining and repairing a charging data transmit processor (CDTP) being an interface between a centralized automatic message accounting (CAMA) center and an mobile switching center (MSC) having an mobile switching center main processor status handler (MSC MPSH) for status handling and control of a processor thereof and a lower-level processor in a personal communication service exchange (PCX) system, includes the mobile switching center main processor status handler (MSC MPSH) periodically sending a status handling signal to the charging data transmit processor (CDTP) by interprocessor communication (IPC), determining whether the mobile switching center man processor status handler (MSC MPSH) receives a response signal from the charging data transmit processor (CDTP), and if the charging data transmit processor (CDTP) is determined to be abnormal, generating an alarm to the mobile switching center (MSC), and providing a message indicating the abnormality is output to the mobile switching center