Uninformed: Informative Information for the Uninformed

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Vol 8» 2007.Sep


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Common VoIP Audio Codecs

For reference, some common VoIP audio Codecs and their encoding and sample properties[19] are listed in Table 2.1 below.


Table 2.1: Common VoIP Audio Codecs
Codec Standard Bit Rate Sample Rate FrameSize
by (kb/s) (kHz) (ms)
G.711 ITU-T 64 8 Sampling
G.721 ITU-T 32 8 Sampling
G.722 ITU-T 64 16 Sampling
G.722.1 ITU-T 24/32 16 20
G.723 ITU-T 24/40 8 Sampling
G.723.1 ITU-T 5.6/6.3 8 30
G.726 ITU-T 16/24/32/40 8 Sampling
G.727 ITU-T variable Sampling
G.728 ITU-T 16 8 2.5
G.729 ITU-T 8 8 10
GSM 06.10 ETSI 13 8 22.5
LPC10 U.S. Gov 2.4 8 22.5
Speex (NB) 8, 16, 32 2.15 - 24.6 30
Speex (WB) 8, 16, 32 4 - 44.2 34
iLBC 8 13.3 30
DoD CELP U.S. DoD 4.8 30
EVRC 3GPP2 9.6/4.8/1.2 8 20
DVI IMA 32 Variable Sampling
L16 128 Variable Sampling


Next: G.711 (alaw/ulaw) Up: RTP Payload Redundant Bits Previous: Audio Word Size   Contents