http://www.rfc-editor.org/rfc/rfc6958.txt
RFC 6958: RTP Control Protocol (RTCP) Extended Report (XR) Block for Burst/Gap Loss Metric Reporting, A. Clark, S. Zhang, J. Zhao, Q. Wu2013-05-01T23:00:00-00:00This document defines an RTP Control Protocol (RTCP) Extended Report (XR) Block that allows the reporting of burst and gap loss metrics for use in a range of RTP applications.