Version 6.4 159 March 2012
SIP User's Manual 12. Media
12.3.6 Configuring 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 for
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 device 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 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 metrics (refer to the Product Reference Manual).
RTCP XR messages containing key call-quality-related metrics are exchanged periodically
(user-defined) between the device and the SIP UA. This allows an analyzer to monitor
these metrics midstream, or a device to retrieve them using SNMP. The device 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. In
addition, the device must be installed with the appropriate Software Upgrade Key. For a
detailed description of the RTCP XR ini file parameters, refer to the device's User's Manual.
The procedure below describes how to configure RTCP XR using the Web interface.
To configure RTCP XR:
1. Open the RTP/RTCP Settings page (Configuration tab > VoIP menu > Media
submenu > RTP/RTCP Settings).
2. Configure the following parameters:
• 'Enable RTCP XR' (VQMonEnable) - enables voice quality monitoring and RTCP
XR.
• 'Minimum Gap Size' (VQMonGMin) - defines the voice quality monitoring -
minimum gap size (number of frames).
• 'Burst Threshold' (VQMonBurstHR) - defines the voice quality monitoring -
excessive burst alert threshold.
• 'Delay Threshold' (VQMonDelayTHR) - defines the voice quality monitoring -
excessive delay alert threshold.
• 'R-Value Delay Threshold' (VQMonEOCRValTHR) - defines the voice quality
monitoring - end of call low quality alert threshold.
• 'RTCP XR Packet Interval' (RTCPInterval) - defines the time interval between
adjacent RTCP reports.
• 'Disable RTCP XR Interval Randomization' (DisableRTCPRandomize) -
determines whether RTCP report intervals are randomized or whether each
report interval accords exactly to the parameter RTCPInterval.
• 'RTCP XR Collection Server Transport Type' (RTCPXRESCTransportType) -
determines the transport layer for outgoing SIP dialogs initiated by the device to
the RTCP-XR Collection Server.
• 'RTCP XR Collection Server' (RTCPXREscIP) - defines the IP address of the
Event State Compositor (ESC).
• 'RTCP XR Report Mode' (RTCPXRReportMode) - determines whether RTCP XR
reports are sent to the ESC and defines the interval in which they are sent.
3. Click Submit.
4. Reset the device for the settings to take effect.
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