AudioCodes Mediant 4000 SBC - Page 982

CHAPTER60 Configuration Parameters Reference
Mediant 4000 SBC | User's Manual
Table 60-32:Coder Parameters
Parameter Description
'SILK Tx Inband FEC'
configure voip > media
settings > silk-tx-
inband-fec
[SilkTxInbandFEC]
Enables forward error correction (FEC) for the SILK coder.
■ [0] Disable (default)
■ [1] Enable
'SILK Max Average Bit Rate'
configure voip > media
settings > silk-max-
average-bitrate
[SilkMaxAverageBitRate]
Defines the maximum average bit rate for the SILK coder.
The valid value range is 6,000 to 50,000. The default is
50,000.
The SILK coder is Skype's default audio codec used for
Skype-to-Skype calls.
'Opus Max Average Bitrate'
configure voip > sip-
definition settings >
opus-max-avg-bitrate
[OpusMaxAverageBitRate
Defines the maximum average bit rate (in bps) for the
Opus coder.
The valid value range is 6000 to 50,000. The default is
50,000.
configure voip > media
settings > vbr-coder-
header-format
[VBRCoderHeaderFormat]
Determines the format of the RTP header for VBR coders.
■ [0] = (Default) Payload only (no header, TOC, or m-
factor) - similar to RFC 3558 Header Free format.
■ [1] = Supports RFC 2658 - 1 byte for interleaving
header (always 0), TOC, no m-factor.
■ [2] = Payload including TOC only, allow m-factor.
■ [3] = RFC 3558 Interleave/Bundled format.
configure voip > media
settings > vbr-coder-
hangover
[VBRCoderHangover]
Defines the required number of silence frames at the
beginning of each silence period when using the VBR
coder silence suppression.
The range is 0 to 255. The default is 1.
'AMR Payload Format'
[AmrOctetAlignedEnable]
Defines the AMR payload format type.
■ [0] Bandwidth Efficient
■ [1] Octet Aligned (default)
Note: The AMR payload type can also be configured per
Coder Group (see Configuring Coder Groups). The Coder
Group configuration overrides the parameter.
configure voip > media
settings > amr-header-
format
[AMRCoderHeaderFormat]
Determines the payload format of the AMR header.
■ [0] = Non-standard multiple frames packing in a single
RTP frame. Each frame has a CMR and TOC header.
■ [1] = AMR frame according to RFC 3267 bundling.
■ [2] = AMR frame according to RFC 3267 interleaving.
■ [3] = AMR is passed using the AMR IF2 format.
Note: Bandwidth Efficient mode is not supported; the
mode is always Octet-aligned.
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