etc-gentoo/asterisk/alsa.conf

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;
; Open Sound System Console Driver Configuration File
;
[general]
;
; Automatically answer incoming calls on the console? Choose yes if
; for example you want to use this as an intercom.
;
autoanswer=yes
;
; Default context (is overridden with @context syntax)
;
context=local
;
; Default extension to call
;
extension=s
;
; Default language
;
;language=en
;
; Default Music on Hold class to use when this channel is placed on hold in
; the case that the music class is not set on the channel with
; Set(CHANNEL(musicclass)=whatever) in the dialplan and the peer channel
; putting this one on hold did not suggest a class to use.
;
;mohinterpret=default
;
; Silence suppression can be enabled when sound is over a certain threshold.
; The value for the threshold should probably be between 500 and 2000 or so,
; but your mileage may vary. Use the echo test to evaluate the best setting.
;silencesuppression = yes
;silencethreshold = 1000
;
; To set which ALSA device to use, change this parameter
;input_device=hw:0,0
;output_device=hw:0,0
;
; Default mute state (can also be toggled via CLI)
;mute=true
;
; If enabled, no audio capture device will be opened. This is useful on
; systems where there will be no return audio path, such as overhead pagers.
;noaudiocapture=true
;------------------------------ JITTER BUFFER CONFIGURATION --------------------------
; jbenable = yes ; Enables the use of a jitterbuffer on the receiving side of an
; ALSA channel. Defaults to "no". An enabled jitterbuffer will
; be used only if the sending side can create and the receiving
; side can not accept jitter. The ALSA channel can't accept jitter,
; thus an enabled jitterbuffer on the receive ALSA side will always
; be used if the sending side can create jitter.
; jbmaxsize = 200 ; Max length of the jitterbuffer in milliseconds.
; jbresyncthreshold = 1000 ; Jump in the frame timestamps over which the jitterbuffer is
; resynchronized. Useful to improve the quality of the voice, with
; big jumps in/broken timestamps, usually sent from exotic devices
; and programs. Defaults to 1000.
; jbimpl = fixed ; Jitterbuffer implementation, used on the receiving side of a SIP
; channel. Two implementations are currently available - "fixed"
; (with size always equals to jbmax-size) and "adaptive" (with
; variable size, actually the new jb of IAX2). Defaults to fixed.
; jbtargetextra = 40 ; This option only affects the jb when 'jbimpl = adaptive' is set.
; The option represents the number of milliseconds by which the new
; jitter buffer will pad its size. the default is 40, so without
; modification, the new jitter buffer will set its size to the jitter
; value plus 40 milliseconds. increasing this value may help if your
; network normally has low jitter, but occasionally has spikes.
; jblog = no ; Enables jitterbuffer frame logging. Defaults to "no".
;-----------------------------------------------------------------------------------