Komisi Pemberantasan Korupsi (KPK) is one of Law enforcement institutions in Indonesia, with mission to eliminate corruption in an open way and transparence. The institution needs telephone network infrastructure among organizations which is reliable and integrated for doing the mission. A project planning is required in order to improve a call center information system application based on IP Telephony project. This is to increase report service system from society regarding corruption activities. This research is included : study of literature to PABX technology and IP Telephony technology; analysis of strength and weakness between both technology; user requirement analysis and planning which is focus on existing information system applied; project planning consist of four knowledge areas management, they are project scope management, project time management, project cost management and project risk management, a call center information system being inplemented, the change discussed. Key word: PABX, IP Telephony; Project Management, Call center