Intel IP Media Server - Manual (Page 16)

16 IP Media Server for HMP Demo Guide — July 2005
Preparing to Run the Demo
• InBand – usually used with G.711 coders
• RFC2833
Capability
Describes the transmit and receive coders. See the Global Call IP Technology Guide for
specific information about coder support. The parameters are as follows:
• TxType – the transmit voice coder
Note: By default, the fax demo is turned off. This feature may be enabled when tested with
T.38 capable IP endpoints. To do this, “uncomment” the line TxType = t38UDPFax
in this section by removing the # from the start of the line, or add the line if not
present.
• TxFramesPerPkt – the number of frames per packet for the selected Tx coder
• TxVAD – specifies if VAD is active for the selected Tx coder
• RxType – the receive voice coder
• RxFramesPerPkt – the number of frames per packet for the selected Rx coder
Note: The G.711 coder defines frames per packet using the packet size in milliseconds, i.e.
10, 20, or 30 milliseconds. Refer to the Sample Configuration File , below, for the
correct syntax for all the parameters.
• RxVAD – specifies if VAD is active for the selected Rx coder
Quality of Service
The application can set threshold values to monitor the quality of service during calls. A fault
occurs when the result of a measurement of a QoS parameter crosses a predefined threshold. A
success occurs when the result of a measurement of a QoS parameter dis not cross a predefined
threshold. The QoS parameters are measured during time intervals, starting when a call is
established. The following parameters are supported:
• MediaAlarmLostPackets – monitors the number of lost IP packets during a call
• MediaAlarmJitter – monitors the jitter (as defined in RFC 1889) during IP transmission
QoS Attributes
The threshold for each QoS parameter is measured with the following six attributes:
• Threshold – defines when a QoS parameter is in a fault condition. A fault occurs when the
result of a measurement of a QoS parameter crossed the Threshold value.
• DebounceOn – the time during which faults are measured (in msec., must be multiple of
Interval)
• DebounceOff – the time during which successes are measured (in msec., must be multiple
of Interval)
• Interval – the amount of time between two QoS parameter measurements (in multiples of
100 msec)
• Percent_Fail – used to detect failure condition, together with DebounceOn (expressed as
a percentage of failures)
• Percent_Success – used to detect failure recovery, together with DebounceOff (expressed
as a percentage of successes)
The default values are as follows:
QoS Type Threshold DebounceOn DebounceOff Interval
Percent_
Fail
Percent_
Success
Lost packets 20 10000 10000 1000 60 40
Jitter 60 20000 60000 5000 60 40