4.4 Packet Loss Notification

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If a RTP packet is lost a notification packet is generated as follows:

Message exchange for packet loss notifications

Figure 10: Message exchange for packet loss notifications

On receipt of the packet with sequence number 3, Host2 detects that the packet with sequence number 2 has not been received. It then sends an RTCP packet pair with a packet loss notification extension. Upon receiving this notification, Host1 causes the encoder to generate an SP-frame to be sent to Host2. The two subsequent video packets, sequence numbers 4 and 5, contain this SP-frame.