Reporting Information To External Party; Configuring Rtcp Xr - AudioCodes Mediant 4000 SBC User Manual

User's Manual
49

Reporting Information to External Party

This section describes features for reporting various information to an external party.
49.1

Configuring 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 (Quality of Experience). RTCP XR information
publishing is implemented in the device according to RFC 6035. 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 as listed in the table below. 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 through SNMP.
Note:
•
The RTCP XR feature is available only if the device is installed with a License Key
that includes this feature. For installing a License Key, see ''License Key'' on page
581.
•
If the RTCP XR feature is unavailable (not licensed or disabled), the R-factor VoIP
metrics are not provided in CDRs (CDR fields, Local R Factor and Remote R
Factor) generated by the device. Instead, these CDR fields are sent with the value
127, meaning that information is unavailable.
You can configure the device to send RTCP XR to a specific IP Group. In addition, you can
configure the device to send RTXP XR at the end of the call and according to a user-
defined interval between consecutive reports.
The device sends RTCP XR in SIP PUBLISH messages. The PUBLISH message contains
the following RTCP XR related header values:

From and To: Telephone extension number of the user.

Request-URI: IP address and port of the SEM server.

Event: "vq-rtcpxr"

Content-Type: "application/vq-rtcpxr"
The type of RTCP XR report event (VQReportEvent) supported by the device is
VQSessionReport (SessionReport). The device can include local and remote metrics in the
RTCP XR. Local metrics are generated by the device while remote metrics are provided by
the remote endpoint. The following table lists the supported voice metrics (parameters)
published in the RTCP XR.
Metric Parameter
CallID -
LocalID -
-
RemoteID
Version 7.2
Table 49-1: RTCP XR Published VoIP Metrics
Call ID - call ID from the SIP dialog
Local ID - identifies the reporting endpoint for the media session
Remote ID - identifies the remote endpoint of the media session
49. Reporting Information to External Party
Description
647 Mediant 4000 SBC