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Voip Audio Codecs

29/8/2017

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Source
Number
Name
Bit rate
​kb/s
Sampling
​kHz
Description
G.711
u-Law
​PCMU
G.711u
64
8
US, Japan T1
G.711
a-Law
​PCMA
G.711a
64
8
Europe (world E1)
G.711.1
​
80 - 96
8
 
G.721
 
32
8
Superceded by G.726
G.722
 
64
16
 
G.722.1
 
24, 32
16
 
G.722.2
AMR-WB
6.6 - 23.85
16
Adaptative multi-rate wideband
G.723
 
24, 40
8
Superceded by G.726
G.723.1
 
5.6, 6.3
8
Part of H.324 video
G.726
 
16, 24, 32, 40
8
Replaces G.721 and G.723
G.727
 
 
 
 
G.728
 
 
 
 
G.729
 
8
8
Low delay (15 ms)
G.729.1
 
8 - 32
8
GSM
 
13
8
LPC
 
2.4
8
Linear
Speex NB
 
8, 16, 32
2.15 - 24.6
Speex WB
 
8, 16, 32
4 - 44.2
iLBC
 
8
13.3
Silk
 
6 - 40
variable
Skype
G.729
 
8
8
Low delay (15 ms)
G.729A
A annex
8
8
Abridged G.729.
G.729 compatible
G.729B
B annex
8
8
Silence suppression. Not compatible
G.729AB
Value
8
8
Abridged ​G.729.
Silence suppression.
​G.729B compatible
G.729D
D annex
6.4
8
G.729E
E annex
11.4
8
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