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4.8 Audio Healer Metrics

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A host adds metrics to the regular RTCP RR to inform the other host about the audio healer in the following way:

Message exchange for audio healer metrics extension

Figure 14: Message exchange for audio healer metrics extension

When Host2 is sending the regular RTCP RR, it adds the healer based profile extension for the current call.

  • On sending the first RTCP RR, RTCP RR-1, Host2 detects that there is no packet loss and it does not need any FEC. Host2 sends this information in RTCP RR-1.

  • On sending the second RTCP RR, RTCP RR-2, Host2 detects that there is a packet loss and it needs FEC with FEC distance =1. Host2 sends this information in RTCP RR-2. Host1 understands this extension and sends the following RTP packets with FEC distance =1.

  • On sending the third RTCP RR, RTCP RR-3, Host2 detects that there is a packet loss, but it can recover because of FEC. It still needs FEC with FEC distance =1. Host2 sends this information in RTCP RR-1. Host1 understands this extension and sends the following RTP packets with FEC distance =1.