3Com VCX v7111 User Manual page 173

Voice Settings Screen
Figure 61
Configure the Voice Settings according to
2
Click Submit to save your changes.
3
To save the changes so they are available after a power fail, see
4
Media Settings, Voice Settings Parameters
Table 56
Parameter
Voice Volume
[VoiceVolume]
Input Gain
[InputGain]
Silence Suppression
[EnableSilenceCompression]
The parameter is used to maintain
backward compatibility.
®
3Com VCX V7111 VoIP Gateway User Guide
Table
Description
Voice gain control in dB. This parameter sets the level for the transmitted
(IP Tel) signal.
The valid range is -32 to 31 dB.
The default value is 0 dB.
PCM input gain control in dB. This parameter sets the level for the
received (Tel 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.
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
EnableSilenceCompression = 1
56.
Saving
annexb=no.
annexb=yes.
Configuration.
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