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Wireless sensor network technology integrates the sensor, computing and wireless technologies. Interconnecting wireless sensor and IP (Internet Protocol) networks could help bridging physical world to our information infrastructure. It could also help external monitoring and control of wireless sensor networks. Interconnecting two networks offers several research challenges in several areas such as addressing, protocol inter-working and routing. This paper examines those challenges and presents a framework for interconnecting IP and wireless sensor networks using inter- working at the transport layer.