This part of ISO/IEC 14496 specifies transport level functionalities for the communication of interactive audiovisual scenes. More specifically: 1. Framework for the carriage of ISO/IEC 14496 contents over IP networks; 2. Guidelines to design RTP payload formats for ISO/IEC 14496 contents including fragmentation and concatenation rules; 3. Usage rules of SDP to transport ISO/IEC 14496-1 related information; 4. MIME type definitions for ISO/IEC14496 contents; and 5. Analysis on RTP Security and Multicasting.