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16 IP Media Server (Global Call) Demo Guide — November 2003
Preparing to Run the Demo
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 crossed a predefined threshold. A
success occurs when the result of a measurement of a QoS parameter did 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:
Sample Configuration File
################################################################################################
# IP Protocol :
# The IP Protocol used for opening the IP Line devices, values: H323, SIP, both
#
# DTMFmode
#possible options:
#OutOfBand, inband, rfc2833
#
# Capability posiblities:
# g711Alaw
# g711Mulaw
#gsm
# gsmEFR
# g723_5_3k
# g723_6_3k
# g729a
# g729ab
# t38UDPFax
#
# Note: if you want to run the demo with coder g729 use:
# g729a for running with VAD disable
# and 729ab for running with VAD enable
#
# Caution:
Threshold DebounceOn DebounceOff Interval
Percent_
Fail
Percent_
Success
Lost packets 20 10000 10000 1000 60 40
Jitter 60 20000 60000 5000 60 40