2.2 Programming
Programming Guide
19
You will see a confirmation screen.
Note
If your entry contains an invalid value, you will be prompted to correct your input. Enter
correct values for the parameters shown in red and try again.
4.
Confirm your entry and click
OK
.
To return to the previous screen, click
CANCEL
.
Parameter Descriptions
QoS Field Settings
The parameters below are used to set the ToS (Type of Service) field in the header of IP packets to control
QoS of VoIP communications.
Jitter Buffer Settings
When voice signals are packetized and transmitted, individual packets can take different paths through the
network and arrive at the destination at varied timings. This is referred to as "jitter", and it can cause
degradation in speech quality. To compensate for jitter problems, the "jitter buffer" accumulates the packets
temporarily for processing.
The parameters below are used to adjust the size of the jitter buffer. However, in general, there is no need to
change the default values.
Jitter buffer Settings (G.711/G.729A/G.723.1 for Voice)
Parameter & Description
Default
Value Range
ToS
Specifies the value in the ToS field by a generic term.
For details, refer to "Detailed Explanations".
Priority: 0
0 to 7
Normal
Normal,
Monetary Cost,
Reliability,
Throughput,
Delay
DSCP
Specifies the value in the ToS field by a DSCP for DiffServ.
No default
0 to 63
HEX
Specifies the value in the ToS field by a hexadecimal number.
No default
00 to FF
Parameter
Default
Value Range
Jitter Buffer Minimum (ms)
20
10 × n (n = 2–10)
Jitter Buffer Maximum (ms)
500
10 × n (n = 2–50)
Jitter Buffer Default (ms)
20
10 × n (n = 2–10)
Jitter Buffer Recovery Start (ms)
200
10 × n (n = 2–10)
Jitter Buffer Recovery Period (s)
10
1 to 20
