Version 5.8 347 September 2009
SIP User's Manual 6. Configuration Parameters Reference
Parameter Description
If EnableSilenceCompression is 2 and IsCiscoSCEMode is
0: 'annexb=yes'.
If EnableSilenceCompression is 2 and IsCiscoSCEMode is
1: 'annexb=no'.
Web: Echo Canceler
EMS: Echo Canceller Enable
[EnableEchoCanceller]
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.
EMS: Echo Canceller Hybrid Loss
[ECHybridLoss]
Sets 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.
[EchoCancellerAggressiveNLP]
Enables or disables the Aggressive NLP at the first 0.5 second
of the call. When enabled, the echo is removed only in the first
half a second of the incoming IP signal.
[0] = Disable (default)
[1] = Enable
Note: For this parameter to take effect, a device reset is
required.
Web: Comfort Noise Generation
Negotiation
EMS: Comfort Noise Generation
[ComfortNoiseNegotiation]
Enables negotiation and usage of Comfort Noise (CN).
[0] Disable = Disable (default).
[1] Enable = Enable.
The use of CN is indicated by including a payload type for CN
on the media description line of the SDP. The device can use
CN with a codec whose RTP time stamp clock rate is 8,000 Hz
(G.711/G.726). The static payload type 13 is used. The use of
CN is negotiated between sides. Therefore, if the remote side
doesn't support CN, it is not used.
Note: Silence Suppression must be enabled to generate CN.
Web: Enable RFC 3389 CN
Payload Type
EMS: Comfort Noise Enable
[EnableStandardSIDPayloadType]
Determines whether Silence Indicator (SID) packets are sent
according to RFC 3389.
[0] Disable = G.711 SID packets are sent in a proprietary
method (default).
[1] Enable = SID (comfort noise) packets are sent with the
RTP SID payload type according to RFC 3389. Applicable
to G.711 and G.726 coders.
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