RFC 3611: RTP Control Protocol Extended Reports (RTCP XR)

Publisher

IETF / RFC Editor

URL

https://www.rfc-editor.org/rfc/rfc3611

Published

2003-11-01

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

IETF Trust Legal Provisions (BCP 78); no-redistribution; short excerpts and locators only

Source notes citing this source

• Standard RTCP loss counters (fraction lost, cumulative lost) count packets that never arrived, while packets that arrive too late for the jitter buffer are reported separately as discards in RTCP XR. A call can therefore sound choppy while basic RTCP shows little loss, and heavy jitter should be checked in that case. inferred in context
• The RTCP XR VoIP Metrics block reports a discard rate, separate from loss rate: the fraction of RTP packets discarded because of late or early arrival, or under-run or overflow at the receiving jitter buffer. in context
• The RTCP XR VoIP Metrics block also carries burst and gap density and duration, round-trip delay, end-system delay (which includes jitter buffer delay), an R factor, MOS-LQ, MOS-CQ, and jitter buffer nominal, maximum and absolute-maximum delay. in context

Cite this source record

APA

WarmTransfer. (2003, November 1). RFC 3611: RTP Control Protocol Extended Reports (RTCP XR). WarmTransfer. https://warmtransfer.net/knowledge/sources/rfc-3611-rtcp-xr-b

BibTeX

@misc{warmtransfer-rfc-3611-rtcp-xr-b,
  title  = {RFC 3611: RTP Control Protocol Extended Reports (RTCP XR)},
  author = {{WarmTransfer}},
  year   = {2003},
  url    = {https://warmtransfer.net/knowledge/sources/rfc-3611-rtcp-xr-b},
  note   = {IETF / RFC Editor, accessed 2026-09-25}
}