Radio frequency identification (RFID) Is a new technology for object identification/tracking systems. In this paper, we propose a novel RFID location management system: SIP-based RFlD management system (SRMS). SRMS employs session initiation protocol (SIP), which is an Internet standard protocol for session management and mobility support. SRMS enhances the existing SIP architecture by introducing a surrogate user agent (SUA) and an SRMS name server (SNS). The SUA performs location registration procedures on behalf of RFID tags with limited capabilities, while the SNS provides name resolution services for location registration/tracking of RFID tags. To evaluate the location registration latency in SRMS, we carry out performance analysis based on queueing models. Compared with the existing RFID management systems, SRMS has advantages of service extensibility and reusability.