AudioCodes Mediant 600 - Page 630

SIP User's Manual 630 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description

If EnableSilenceCompression is 2 and IsCiscoSCEMode is 0:
'annexb=yes'.
 If EnableSilenceCompression is 2 and IsCiscoSCEMode is 1:
'annexb=no'.
Note: This parameter can also be configured per IP Profile, using
the IPProfile parameter (see 'Configuring IP Profiles' on page
219).
Web: Echo Canceler
EMS: Echo Canceller Enable
[EnableEchoCanceller]
Enables echo cancellation (i.e., echo from voice calls is
removed).
 [0] Disable
 [1] Enable (default)
Note: This parameter can also be configured per IP Profile, using
the IPProfile parameter (see 'Configuring IP Profiles' on page
219) and per Tel Profile, using the TelProfile parameter (see
'Configuring Tel Profiles' on page 217).
Web: Max Echo Canceller Length
[MaxEchoCancellerLength]
Defines 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 may reduce channel capacity. For example:
with DSP Template 0 and number of spans 4, the capacity is
reduced from 120 to 100. The reduction depends on the
combination of “DSP Template” and “Number of Spans”. For
accurate figures, see DSP Templates on page 835.

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 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.
EMS: Echo Canceller Hybrid
Loss
[ECHybridLoss]
Defines the four-wire to two-wire worst-case Hybrid loss, the ratio
between the signal level sent to the hybrid and the echo level
returning from the hybrid.
 [0] = 6 dB (default)
 [1] = N/A
 [2] = 0 dB
 [3] = 3 dB
[ECNLPMode]
Defines the echo cancellation Non-Linear Processing (NLP)
mode.
 [0] = NLP adapts according to echo changes (default).
 [1] = Disables NLP.
 [2] = Silence output NLP.