Frtp Control Protocol Extended Reports (Rtcp-Xr) - AudioCodes Mediant 1000 User Manual

SIP User's Manual
F RTP Control Protocol Extended Reports
(RTCP-XR)
RTP Control Protocol Extended Reports (RTCP-XR) is a VoIP management control that
defines a set of metrics containing information for assessing VoIP call quality and
diagnosing problems. RTCP-XR (RFC 3611) extends the RTCP reports defined in RFC
3550 by providing additional VoIP metrics.
RTCP-XR information publishing is implemented in the media server according to <draft-
johnston-sipping-rtcp-summary-07>. This draft defines how a SIP User Agent (UA)
publishes the detailed information to a defined collector.
RTCP-XR messages containing key call-quality-related metrics are exchanged periodically
(user-defined) between the gateway and the SIP UA. This allows an analyzer to monitor
these metrics midstream, or a gateway to retrieve them using SNMP. The gateway can
send RTCP-XR reports to an Event State Compositor (ESC) server using PUBLISH
messages. These reports can be sent at the end of each call (configured using
RTCPXRReportMode) and according to a user-defined interval (RTCPInterval or
DisableRTCPRandomize) between consecutive reports.
To enable RTCP-XR reporting, the VQMonEnable ini file parameter must be set to 1.
For a detailed description of the RTCP-XR parameters, refer to
RTCP-XR measures VoIP call quality such as packet loss, delay, signal / noise / echo
levels, estimated R-factor, and mean opinion score (MOS). RTCP-XR measures these
parameters using the metrics listed in the table below.
Table F-1: RTCP-XR Published VoIP Metrics (continues on pages 427 to 428)
Start Timestamp
Stop Timestamp
Call-ID
Local Address (IP, Port & SSRC)
Remote Address (IP, Port & SSRC)
Payload Type
Payload Description
Sample Rate
Frame Duration
Frame Octets
Frames per Packets
Packet Loss Concealment
Silence Suppression State
Jitter Buffer Adaptive
Jitter Buffer Rate
Jitter Buffer Nominal
Jitter Buffer Max
Jitter Buffer Abs Max
Network Packet Loss Rate
Jitter Buffer Discard Rate
Version 5.0
F. RTP Control Protocol Extended Reports (RTCP-XR)
Metric Name
General
Session Description
Jitter Buffer
Packet Loss
427
5.6.2.3 on page 154.
December 2006