os : centos 6.5
asterisk : 11.6.1
requirements : speex-1.2rc1 installed & asterisk remake
*Table 4:* Quality versus bit-rate
Mode Bit-rate (bps) mflops Quality/description
0 250 N/A No transmission (DTX)
1 2,150 6 Vocoder (mostly for comfort noise)
2 5,950 9 Very noticeable artifacts/noise, good intelligibility
3 8,000 10 Artifacts/noise sometimes noticeable
4 11,000 14 Artifacts usually noticeable only with headphones
5 15,000 11 Need good headphones to tell the difference
6 18,200 17.5 Hard to tell the difference even with good headphones
7 24,600 14.5 Completely transparent for voice, good quality music
8 3,950 10.5 Very noticeable artifacts/noise, good intelligibility
vi /etc/asterisk/codecs.conf
[speex]
;0-10
quality => 4
;0-10
complexity => 4
; true / false
enhancement => true
; true / false
vad => false
; true / false
vbr => false
; 0 = off, otherwise, target bitrate in bps
abr => 8000
;0-10
vbr_quality => 5
; true / false
dtx => false
CLI>reload
origin : http://lists.digium.com/pipermail/asterisk-users/2005-January/073992.html
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