On this page5. RTP Payload Format5. RTP Payload Format Contents 5.1. RTP Header Usage 5.2. Payload Structures 5.3. NAL Unit Header Usage 5.4. Packetization Modes 5.5. Decoding Order Number (DON) 5.6. Single NAL Unit Packet 5.7. Aggregation Packets 5.7.1. Single-Time Aggregation Packet (STAP) 5.7.2. Multi-Time Aggregation Packets (MTAPs) 5.8. Fragmentation Units (FUs)