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2.2 Programming
CODEC Frame Settings
The parameters below are used to set the interval between packet transmissions for each type of CODEC. It
is recommended that all VoIP Gateway Cards in a VoIP network have the same settings for these parameters.
For details, refer to "Detailed Explanations".
Parameter
G.723.1 Packet Sending Interval (ms)
G.729A Packet Sending Interval (ms)
G.711 Packet Sending Interval (ms)
Others
Parameter & Description
Echo Canceller
Specifies the use of the echo cancellation feature (G.168).
Echo is the audible duplication of a caller's voice on the return
path; when echo exists, the caller hears his or her own voice
after some delay. The echo canceller eliminates this echo.
Note
There are various factors that may cause an echo. In
some cases, this feature does not eliminate the echo
entirely.
G.723.1 VAD (Voice Activity Detection)
Specifies the use of the VAD feature (G.723.1).
The VAD conserves bandwidth by detecting silent periods
during a call and suppressing the packets of silence from
being sent to the network.
Note
To use this feature, both the local and remote cards must
have this parameter set to "Use".
G.723.1 Rate
Specifies the rate of the G.723.1 CODEC.
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".
FAX Signal Detection
Specifies the use of the fax signal detection feature.
Fax signal detection enables end-to-end fax signal relay over
the network.
For details, refer to "Detailed Explanations".
20
Programming Guide
Default
Value Range
30
30, 60, 90
20
20, 30, 40
20
20, 30, 40
Default
Value Range
Use
Use,
Don't use
Use
Use,
Don't use
6.3Kbps
5.3Kbps,
6.3Kbps
Use
Use,
Don't use
Don't use
Use,
Don't use
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