This book constitutes the refereed proceedings of the IFIP International Conference on Intelligence in Communication Systems, INTELLICOMM 2004, held in Bangkok, Thailand in November 2004. The 24 revised full papers presented together with 5 invited papers were carefully reviewed and selected from 112 submissions. The papers are organized in topical sections on QoS and security, intelligent communication systems with NLP, QoS, location and context aware services, protocol and application architectures, adaptability architectures, and network and mobility management.