QuadroM 32x/8L/26x/12Li/26xi Manual II: Administrator's Guide
Administrator’s Menus
QuadroM 32x/8L/26x/12Li/26xi; (SW Version 5.2.x)
85
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 Statistics
1.
Enter the desired criteria fields.
2.
Press
the
Filter
button to search the call reports within the
Call Statistics
table.
Please Note:
To return to the complete
Statistics Table
, clear all search criteria and press
Filter
.
To Reset the Statistics
1.
Press
the
Clear All Records
button in the
Call Statistics Settings
page.
2.
Confirm the deletion by clicking on
Yes
. The call statistics 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 Quadro 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 Quadro’s IP line to an
external SIP destination or from one external SIP destination to
another through the Quadro’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 Quadro and the other leg describes the
RTP stream from Quadro 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-151: 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.
