| Value | Meaning |
|---|---|
| Invalid-1 | Invalid XR Report Block |
| Lrle1 | Loss RLE Report Block |
| Drle2 | Duplicate RLE Report Block |
| Prt3 | Packet Receipt Times Report Block |
| Rrt4 | Receiver Reference Time Report Block |
| Dlrr5 | Delay since the last Receiver Report |
| Ssumm6 | Statistics Summary Report Block |
| VoipMetrics7 | VoIP Metrics Report Block |
Types of RTCP Extended Reports, those are defined in RFC 3611 and other RFCs according to the IANA registry.