3Com V6100, User Manual Manual, Page: 234 / 496

234
V6100 and V7122 User Guide
ini File Field Name
Web Parameter Name
Valid Range and Description
EnableSilenceCompression
[Silence Suppression]
The parameter
SCE is used to
maintain backward compatibility.
0 = Silence Suppression disabled (default).
1 = Silence Suppression enabled.
2 [Enable without adaptation] = 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’.
EnableSilenceCompression = 2 and IsCiscoSCEMode = 0
Æ
‘annexb=yes’.
EnableSilenceCompression = 2 and IsCiscoSCEMode = 1
Æ
‘annexb=no’.
IsCiscoSCEMode 0 = There isn’t a Cisco gateway at the remote side (default).
1 = There is a Cisco gateway at the remote side.
When there is a Cisco gateway at the remote side, the local gateway
must set the value of the ‘annexb’ parameter of the fmtp attribute in the
SDP to ‘no’. This logic should be used if ‘EnableSilenceCompression =
2’ (enable without adaptation). In this case, Silence Suppression should
be used on the channel but not declared in the SDP.
EnableEchoCanceller
[Echo Canceler]
The parameter
ECE is used to
maintain backward compatibility.
0 = Echo Canceler disabled.
1 = Echo Canceler Enabled (default).
Refer also to the parameters ‘MaxEchoCancellerLength’
(described in
Table 43 ).
EnableNoiseReduction Enables / disables the DSP Noise Reduction mechanism.
0 = Disable (default).
1 = Enable.
When this parameter is enabled the channel capacity might
be reduced.
EnableStandardSIDPayloadTyp
e
[Enable RFC 3389 CN Payload
Type]
Determines whether Silence Indicator (SID) packets that are sent and
received are according to RFC 3389.
0 = G.711 SID packets are sent in a proprietary method (default).
1 = SID (comfort noise) packets are sent with the RTP SID payload type
according to RFC 3389. Applicable to G.711 and G.726 coders.
RTPSIDCoeffNum Determines the number of spectral coefficients added to an SID packet
being sent according to RFC 3389. Valid only if
‘EnableStandardSIDPayloadType’ is set to 1.
The valid values are 0 (default), 4, 6, 8 and 10.
DTMFVolume
[DTMF Volume]
-31 to 0 corresponding to -31 dBm to 0 dBm in 1 dB steps (default = -11
dBm) DTMF gain control.