HP 5920 Configuration Guide

131
Configuring the voice operation
CAUTION:
To ensure successful voice operations and avoid affecting existing services, do not perform the operations
on well-known ports from 1 to 1023.
The voice operation measures VoIP network performance.
The voice operation works as follows:
1. The NQA client sends voice packets of G.711 A-law, G.711 μ-law or G.729 A-law codec type at
a specific interval to the destination device (NQA server).
2. The destination device takes a time stamp to each voice packet it receives and sends it back to the
source.
3. Upon receiving the packet, the source device calculates the jitter and one-way delay based on the
time stamp.
The following parameters that reflect VoIP network performance can be calculated by using the metrics
gathered by the voice operation:
• 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 service quality.
The evaluation of voice quality depends on users' tolerance for voice quality, which you should consider.
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, it subtracts the advantage factor to modify
ICPIF and MOS values, so both objective and subjective factors are considered.
The voice operation requires both the NQA server and the NQA client. Before you perform a voice
operation, configure a UDP listening service on the NQA server. For more information about UDP
listening service configuration, see "Configuring the NQA server."
T
he v
oice operation cannot repeat.
To configure the voice operation:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Create an NQA operation
and enter NQA operation
view.
nqa entry admin-name
operation-tag
By default, no NQA operation is
created.
3. Specify the voice type and
enter its view.
type voice N/A
4. Specify the destination
address of voice packets.
destination ip ip-address
By default, no destination IP address
is configured.
The destination IP address must be
the same as that of the listening
service on the NQA server.

HP 5920 Specifications

General

Brand	HP
Model	5920
Category	Switch
Language	English