Yealink SIP-T2XP Administrator's Manual page 410

Administrator's Guide for SIP-T2xP IP Phones
Phone User Interface:
None
The VQ-RTCPXR mechanism, complaint with
reports contained in SIP PUBLISH messages to the central report collector. Three types of
quality reports can be enabled:
Session: Generated at the end of a call.

Interval: Generated during a call at a configurable period.

Alert: Generated when the call quality degrades below a configurable threshold.

A wide range of performance metrics are generated in the following two ways:
Based on current values, such as jitter, jitter buffer max and round trip delay.

Computed using other metrics as input, such as listening Mean Opinion Score

(MOS-LQ) and conversational Mean Opinion Score (MOS-CQ).
To operate with central report collector, IP phones must be configured to forward their
voice quality reports to the specified report collector. You can specify the report collector
on a per-line basis.
Users can check
interface. Users can also specify the
phone user interface. Options of the RTP status to be displayed on the web user
interface cannot be specified.
Note When using voice quality monitoring feature, some problems will occur:
1. GapDuration always equals to 0 while no burst duration.
2. JitterBufferAdaptive always equals to 2 (non-adaptive/fixed), even if it's configured
adaptive.
3. MOSLQ/MOSCQ may be lower or higher than what VQMon calculates sometimes
(
error of [1, +0.5]).
The problems will be fixed in firmware version 80.
Procedure
RTCP-XR can be configured using the configuration files or locally.
Configuration
File
392
Parameters
the voice quality data of the last call via web user interface or phone user
options of the RTP status to be displayed on the
Configure the generation of session packets.
<y0000000000xx>
Parameter:
.cfg
phone_setting.vq_rtcpxr.session_report.enable
Permitted Values
RFC 6035, sends the service quality metric
Default