QX1000 Manual II: Administrator's Guide
Administrator’s Menus
QX1000; (SW Version 5.3.x)
93
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.
Please Note:
RTP Statistics is logged only when at least one of the call endpoints is located on the QX1000. For example, it will not be logged when:
•
calls incoming from or addressed to the IP lines or remote extension,
•
calls from an external user are routed to another external user through QX1000’s routing rules.
In the first case, RTP statistics will be logged if remote extension or IP line user is calling locally to the QX1000’s extension or auto attendant.
The
Configure Call Quality Event Notification
link leads to the
Configure Call Quality Event Notification
page where call quality control
notification specifics can be configured.
From the
Configure Call Quality Event Notification
page you may configure event notification policy when the call quality is lower than the
allowed level.
This page consists of a
Notify
checkbox, which enables the call
quality monitoring mechanism for the corresponding event
notifications, and a
Call Quality less than
drop down list where the
least satisfactory call quality should be selected. When a call with the
quality less than the level selected here is registered on the QX1000,
an event notification will appear. When the
Notify
checkbox is
disabled, no Call Quality events will occur on the QX1000.
Please Note:
The ways of notification for the Call Quality events
should be configured from the
page.
Fig. II-155: Configure Call Quality Event Notification page
The
Configure System Events
page where the methods of notification for each system event can be configured.
FAX Statistics
The
FAX statistics
page is accessed from the Call Statistics page by
clicking on the
FAX
link in the
Details
column for the calls that
contain T.38 FAX transmission.
The
FAX statistics
page provides information about received and
transmitted packets, lost, bad and duplicated packets. This statistics
refers only to the T.38 FAX transmission. The FAX statistics is not
available for the FAX transmitted with other protocols.
Fig. II-156: FAX Statistics page
SIP Settings
The
SIP Settings
provide information on the SIP receive UDP and TCP ports and allows you to select DNS server configurations for SIP and the SIP
timers scheme.
