H3C S3100V2-52TP, Руководство по настройке, Страница: 141 / 224

129
• Calculated Planning Impairment Factor (ICPIF)—Measures impairment to voice quality in a VoIP
network. It is decided by packet loss and delay. A higher value represents a lower service quality.
•
Mean Opinion Scores (MOS)—A MOS value can be evaluated by using the ICPIF value, in the
range of 1 to 5. A higher value represents a higher quality of a VoIP network.
The evaluation of voice quality depends on users’ tolerance for voice quality, which should be taken into
consideration. For users with higher tolerance for voice quality, use the
advantage-factor command to
configure the advantage factor. When the system calculates the ICPIF value, this advantage factor is
subtracted to modify ICPIF and MOS values, so objective and subjective factors are both considered
when you evaluate voice quality.
Configuration prerequisites
Voice tests require cooperation between the NQA server and the NQA client. Before you start voice tests,
configure a UDP listening service on the NQA server. For more information about UDP listening service
configuration, see “ Configuring the NQA server .”
Configuring voice tests
Follow these steps to configure voice tests:
To do… Use the command… Remarks
Enter system view system-view —
Enter NQA test group
view
nqa entry admin-name
operation-tag
—
Configure the test type as
voice, and enter test type
view
type voice Required
Configure the destination
address of voice probe
packets destination ip ip-address
Required
By default, no destination IP address is configured
for a test operation.
The destination IP address must be the same as that
of the listening service on the NQA server.
Configure the destination
port of voice probe
packets
destination port
port-number
Required
By default, no destination port number is
configured.
The destination port must be the same as that of the
listening service on the NQA server.
Configure the codec type
codec-type { g711a |
g711u | g729a }
Optional
By default, the codec type is G.711 A-law.
Configure the advantage
factor for calculating
MOS and ICPIF values
advantage-factor factor
Optional
By default, the advantage factor is 0.
Specify the source IP
address of probe packets
source ip ip-address
Optional
By default, no source IP address is specified.
The source IP address must be the IP address of a
local interface. The local interface must be up;
otherwise, no probe packets can be sent out.
Specify the source port
number of probe packets
source port port-number
Optional
By default, no source port number is specified.