AudioCodes Media Pack MP-11x, User Manual

Page: 423 / 650

Version 6.6 423 MP-11x & MP-124
User's Manual 38. Reporting Information to External Party
38 Reporting Information to External Party
This section describes features for reporting various information to an external party.
38.1 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 as listed in the table below.
Note: RTCP XR is a customer ordered feature and thus, must be included in the
Software License Key installed on the device.
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.
You can configure the device to send RTCP XR to an Event State Compositor (ESC)
server or for Gateway calls, to a specific IP Group (using the PublicationIPGroupID ini file
parameter). If you configure it to send RTCP XR to an IP Group, the RTCP XR is sent to
the address configured for the Proxy Set associated with the IP Group.
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 when sent to the ESC server.
When sent to an IP Group, the Request-URI value contains the name of the IP Group
as configured by the 'IP Group Name' parameter (IPGroup_Name).

Event: "vq-rtcpxr"

Content-Type: "application/vq-rtcpxr"
You can configure the stage of the call at which you want the device to send RTCP XR:

End of the call.

Periodically, according to a user-defined interval between consecutive reports.

(Gateway Application Only) End of a media segment. A media segment is a change in
media, for example, when the coder is changed or when the caller toggles between
two called parties (using call hold/retrieve). The RTCP XR sent at the end of a media
segment contains information only of that segment. For call hold, the device sends
RTCP XR each time the call is placed on hold and each time it is retrieved. In addition,
the Start timestamp in the RTCP XR indicates the start of the media segment; the End
timestamp indicates the time of the last sent periodic RTCP XR (typically, up to 5
seconds before reported segment ends).
Table 38-1: RTCP XR Published VoIP Metrics
Group Metric Name
General Start Timestamp