AudioCodes Mediant 600 User Manual page 424

Parameter
Web: Silence Suppression
EMS: Silence Compression Mode
[EnableSilenceCompression]
Web: Echo Canceler
EMS: Echo Canceller Enable
[EnableEchoCanceller]
Web: Max Echo Canceller Length
[MaxEchoCancellerLength]
SIP User's Manual
Silence Suppression is a method for conserving bandwidth on
VoIP calls by not sending packets when silence is detected.
[0] Disable = Silence Suppression is disabled (default).
[1] Enable = Silence Suppression is enabled.
[2] Enable without Adaptation = A single silence packet is
sent during a silence period (applicable only to G.729).
Note: If the selected coder is G.729, the value of the 'annexb'
parameter of the fmtp attribute in the SDP is determined by
the following rules:
If EnableSilenceCompression is 0: 'annexb=no'.
If EnableSilenceCompression is 1: 'annexb=yes'.
If EnableSilenceCompression is 2 and IsCiscoSCEMode is
0: 'annexb=yes'.
If EnableSilenceCompression is 2 and IsCiscoSCEMode is
1: 'annexb=no'.
Determines whether echo cancellation is enabled and
therefore, echo from voice calls is removed.
[0] Off = Echo Canceler is disabled.
[1] On = Echo Canceler is enabled (default).
Note: This parameter is used to maintain backward
compatibility.
Determines the maximum Echo Canceler Length (in msec),
which is the maximum echo path delay (tail length) for which
the echo canceller is designed to operate:
[0] Default = based on various internal device settings to
attain maximum channel capacity (default)
[11] 64 msec
[22] 128 msec
Notes:
For this parameter to take effect, a device reset is required.
Using 128 msec reduces the channel capacity to 200
channels.
When housed with an analog/BRI module, the device
(Mediant 1000) can use a max. echo canceller length of 64
msec.
When housed with PRI TRUNKS module, the device
(Mediant 1000) can use a max. echo canceller length of
128 msec.
When set to 128 msec, the number of available channels is
reduced by a factor of 5/6 (for Mediant 1000).
When housed with an MPM module (in Slot #6), no channel
reduction occurs (for Mediant 1000).
It is unnecessary to configure the parameter
EchoCancellerLength, as it automatically acquires its value
from this parameter.
424
Mediant 600 & Mediant 1000
Description
Document #: LTRT-83305