3Com
®
VCX V7111 VoIP Gateway User Guide
173
Figure 61
Voice Settings Screen
2
Configure the Voice Settings according to
Table 56
.
3
Click
Submit
to save your changes.
4
To save the changes so they are available after a power fail, see
Saving Configuration
.
Table 56
Media Settings, Voice Settings Parameters
Parameter Description
Voice Volume
[VoiceVolume]
Voice gain control in dB. This parameter sets the level for the transmitted
(IP
Æ
Tel) signal.
The valid range is -32 to 31 dB.
The default value is 0 dB.
Input Gain
[InputGain]
PCM input gain control in dB. This parameter sets the level for the
received (Tel
Æ
IP) signal.
The valid range is -32 to 31 dB.
The default value is 0 dB.
This parameter is intended for advanced users. Changing it
affects other gateway functionalities.
Silence Suppression
[EnableSilenceCompression]
The parameter is used to maintain
backward compatibility.
Disable
[0]
= Silence Suppression disabled (default).
Enable
[1]
= Silence Suppression enabled.
Enable without adaptation
[2]
= A single silence packet is sent during
silence period (applicable only to G.729).
Silence Suppression is a method conserving bandwidth on VoIP calls by
not sending packets when silence is detected.
If the selected coder is G.729, the following rules determine the
value of the annexb parameter of the fmtp attribute in the SDP.
EnableSilenceCompression = 0
Æ
annexb=no.
EnableSilenceCompression = 1
Æ
annexb=yes.
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