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2.2 Programming
Programming Guide 21
Gain Level Settings
The parameters below are used to adjust the gain level. However, in general, there is no need to change the
default values.
Voice Activity Detection (VAD) Settings
Others
Parameter & Description Default Value Range
Gain Level PCM → LAN (dB)
Specifies the gain level (in decibels) output from the PBX,
through the card, to the LAN.
0 -14 to 6
Gain Level LAN → PCM (dB)
Specifies the gain level (in decibels) output from the LAN,
through the card, to the PBX.
0 -14 to 6
Parameter & Description Default Value Range
G.723.1/G.729A/G.711 VAD
Specifies the use of the VAD feature for each available
CODEC (G.723.1, G.729A, and G.711).
The VAD conserves bandwidth by detecting silent periods
during a call and suppressing the packets of silence from
being sent to the network.
Notes
• To use the VAD feature for a certain CODEC, be
sure to enable it for that CODEC on both the local
and remote cards.
• To use the VAD feature between the KX-TDA0490
and KX-TDA5480/KX-TDA0484, you must enable it
for the G.723.1 CODEC. Otherwise, the VAD feature
cannot be used between these cards (although calls
can be made and received as normal).
Use Use,
Don't use
Parameter & Description Default Value Range
G.723.1 Rate
Specifies the rate of the G.723.1 CODEC.
6.3Kbps 5.3Kbps,
6.3Kbps
DTMF Detection
Specifies the use of the DTMF detection feature.
DTMF detection enables end-to-end DTMF relay over the
network.
For details, refer to "Detailed Explanations".
Use Use,
Don't use