Epygi QX50 User Manual

QX50/QX200/QX2000; (SW Version 6.0.x) 154
QX50/QX200/QX2000 Manual II: Administrator’s Guide
2. Select or deselect the Enable Call Reporting checkbox to enable or disable statistics recording.
3. If enabling the statistics, the maximum number of records to be stored in the statistics table should be selected from the corresponding drop down
lists.
4. Press Save to apply the new configuration.
To Filter the Call History
1. Enter the desired criteria fields.
2. Press the Filter button to search the call reports within the Call History table.
Please Note: To return to the complete Call History table, clear all search criteria and press Filter.
To Reset the Call History
1. Press the Clear All Records button in the Call History Settings page.
2. Confirm the deletion by clicking on Yes. The Call History will then be deleted. To abort the deletion and keep the statistics information, click on No.
RTP Statistics
The
RTP Statistics
page provides detailed information about the
established call is provided. When QX IP PBX serves as an RTP proxy,
this page displays two groups (legs) of RTP statistics. For example,
when calling from an IP Phone attached to the QX IP PBX’s IP line to an
external SIP destination or from one external SIP destination to another
through the QX IP PBX’s Auto Attendant. Each group of parameters
describes characteristics of a piece of RTP stream composing an overall
SIP session. Normally, one leg describes the RTP stream from caller to
the QX IP PBX and the other leg describes the RTP stream from QX IP
PBX to the destination.
Quality - estimated call quality, which depends on RTP statistic. Below
is the legend for Call Quality definitions on the displayed RTP Statistics:
excellent – RX Lost Packets < 1% & RX Jitter < 20
good - RX Lost Packets < 5% & RX Jitter < 80
satisfactory - RX Lost Packets < 10% & RX Jitter < 150
bad - RX Lost Packets < 20% & RX Jitter < 200
very bad - RX Lost Packets > 20% or RX Jitter > 200
Fig.II- 251: RTP Statistics page
The Local and Remote fields indicate the two peers between which the RTP stream is transmitted. The characteristics in the table below describes to the
piece of RTP stream between these peers.
Rx/Tx Codec - codec for received and transmitted RTP stream respectively.
Rx/Tx Packets - number of RTP packets received and transmitted respectively.
Rx/Tx Packet Size - size of RTP packet (payload) received and transmitted respectively.
Rx Lost Packets - number of lost RTP packets for received stream.
Rx Jitter - inter-arrival jitter is an estimate of the statistical variance of the RTP data packet inter-arrival time, measured in timestamp units.
The inter-arrival jitter is defined to be the mean deviation (smoothed absolute value) of the difference D in packet spacing at the receiver compared to the
sender for a pair of packets. If Si is the RTP timestamp from packet i, and Ri is the time of arrival in RTP timestamp units for packet i, then for two packets i
and j, D may be expressed as:
D(i,j) = (Rj - Ri) - (Sj - Si) = (Rj - Sj) - (Ri - Si)
J(i) = J(i-1) + (|D(i-1,i)| - J(i-1))/16, where J(i) is Rx Jitter for packet i.
For more details about Jitter calculations, please refer to the RFC1889.
Rx Maximum Delay - maximum variance (absolute value) of actual arrival time of the RTP data packet compared to estimated arrival time, measured in
milliseconds.
If Si is the RTP timestamp from packet i, and Ri is the time of arrival in RTP timestamp units for packet i, then variance for packet i may be expressed as
following: V(i) = |(Ri - R1) - (Si - S1)| = |(Ri - Si) - (R1 - S1)|
Rx Maximum Delay = max V(i) / 8
RX Delay Increase Count – indicates the number of times the delay in jitter buffer is increased during the call.
RX Delay Decrease Count - indicates the number of times the delay in jitter buffer is decreased during the call.

Epygi QX50 Specifications

General

Brand	Epygi
Model	QX50
Category	Network Hardware
Language	English