Table 3: MOS score [9].

CompressionBit rate (kbps)MOS scoreCompression delay (ms)

G.711 PCM644.10.75
G.726 ADPCM323.851
G.728 LD-CELP163.613 to 5
G.729 CS-ACELP83.9210
G.729 × 2 encodings83.2710
G.729 × 3 encodings82.6810
G.729a CS-ACELP83.710
G.723.1 MP-MLQ6.33.930
G.723.1 ACELP5.33.6530