http://www.rfc-editor.org/rfc/rfc7097.txt
RFC 7097: RTP Control Protocol (RTCP) Extended Report (XR) for RLE of Discarded Packets, J. Ott, V. Singh, I. Curcio2014-01-01T23:00:00-00:00The RTP Control Protocol (RTCP) is used in conjunction with the Real- time Transport Protocol (RTP) in order to provide a variety of short- term and long-term reception statistics. The available reporting may include aggregate information across longer periods of time as well as individual packet reporting. This document specifies a per-packet report metric capturing individual packets discarded from the de- jitter buffer after successful reception.