[speex] ; CBR encoding quality [0..10] ; used only when vbr = false quality => 3 ; codec complexity [0..10] ; tradeoff between cpu/quality complexity => 2 ; perceptual enhancement [true / false] ; improves clarity of decoded speech enhancement => true ; voice activity detection [true / false] ; reduces bitrate when no voice detected, used only for CBR ; (implicit in VBR/ABR) vad => true ; variable bit rate [true / false] ; uses bit rate proportionate to voice complexity vbr => true ; available bit rate [bps, 0 = off] ; encoding quality modulated to match this target bit rate ; not recommended with dtx or pp_vad - may cause bandwidth spikes abr => 0 ; VBR encoding quality [0-10] ; floating-point values allowed vbr_quality => 4 ; discontinuous transmission [true / false] ; stops transmitting completely when silence is detected ; pp_vad is far more effective but more CPU intensive dtx => false ; preprocessor configuration ; these options only affect Speex v1.1.8 or newer ; enable preprocessor [true / false] ; allows dsp functionality below but incurs CPU overhead preprocess => false ; preproc voice activity detection [true / false] ; more advanced equivalent of DTX, based on voice frequencies pp_vad => false ; preproc automatic gain control [true / false] pp_agc => false pp_agc_level => 8000 ; preproc denoiser [true / false] pp_denoise => false ; preproc dereverb [true / false] pp_dereverb => false pp_dereverb_decay => 0.4 pp_dereverb_level => 0.3 [plc] ; for all codecs which do not support native PLC ; this determines whether to perform generic PLC ; there is a minor performance penalty for this genericplc => true ; Generate custom formats for formats requiring attributes. ; After defining the custom format, the name used in defining ; the format can be used throughout Asterisk in the format 'allow' ; and 'disallow' options. ; ; Example: silk8 is a predefined custom format in this config file. ; Once this config file is loaded, silk8 can be used anywhere a ; peer's codec capabilities are defined. ; ; In sip.conf 'silk8' can be defined as a capability for a peer. ; [peer1] ; type=peer ; host=dynamic ; disallow=all ; allow=silk8 ;custom codec defined in codecs.conf ; ; LIMITATIONS ; Custom formats can only be defined at startup. Any changes to this ; file made after startup will not take into effect until after Asterisk ; is restarted. ; ; Default Custom SILK format definitions, only one custom SILK format per ; sample rate is allowed. [silk8] type=silk samprate=8000 fec=true ; turn on or off encoding with forward error correction. ; On recommended, off by default. packetloss_percentage=10 ; Estimated packet loss percentage in uplink direction. This ; affects how much redundancy is built in when using fec. ; The higher the percentage, the larger amount of bandwidth is ; used. Default is 0%, 10% is recommended when fec is in use. maxbitrate=10000 ; Use the table below to make sure a useful bitrate is choosen ; for maxbitrate. If not set or value is not within the bounds ; of the encoder, a default value is chosen. ; ; sample rate | bitrate range ; 8khz | 5000 - 20000 bps ; 12khz | 7000 - 25000 bps ; 16khz | 8000 - 30000 bps ; 24khz | 20000- 40000 bps ; ;dtx=true ; Encode using discontinuous transmission mode or not. Turning this ; on will save bandwidth during periods of silence at the cost of ; increased computational complexity. Off by default. [silk12] type=silk samprate=12000 maxbitrate=12000 fec=true packetloss_percentage=10; [silk16] type=silk samprate=16000 maxbitrate=20000 fec=true packetloss_percentage=10; [silk24] type=silk samprate=24000 maxbitrate=30000 fec=true packetloss_percentage=10;