RFC 文档RFC 3611 - RTP Control Protocol Extended Reports (RTCP XR)6.2. RTCP XR Block Type Registry (RTCP XR 块类型注册表)6.2. RTCP XR Block Type Registry (RTCP XR 块类型注册表) 此兼容页面用于保留 RFC 3611 小节链接. 本小节内容已合并在 6. IANA Considerations (IANA 注意事项).